{"dp_type": "Dataset", "free_text": "Greenland"}
[{"awards": "1745078 Brook, Edward", "bounds_geometry": ["POINT(-112.05 -79.28)"], "date_created": "Thu, 05 Oct 2023 00:00:00 GMT", "description": "This dataset includes measurements of atmospheric methane from samples from the NEEM, GISP2 and WAIS Divide ice cores. All measurements were made at the Oregon State University Ice Core and Quaternary Geochemistry Laboratory (Corvallis, OR) using an established analytical system. 433 samples from the NEEM ice core were measured between 1420 and 1560m depths. A measurement uncertainty ranging from 2.8 to 4.2 ppb, depending on the measurement year, was determined from replicate samples. 340 samples from the GISP2 ice core were measured between 1740 and 2060m depths. A measurement uncertainty ranging from 3.1 to 3.4 ppb, depending on the measurement year, was determined from replicate samples. All GISP2 and NEEM data were corrected for excess methane contamination using the established relationship between excess methane and Ca2+ (Lee et al., 2020). Both corrected and uncorrected data are included in the publication. 340 samples from the GISP2 ice core were measured between 1957 and 3081m depths. A measurement uncertainty ranging from 3.1 to 3.4 ppb, depending on the measurement year, was determined from replicate samples. Depths reflect the mid-points of the depth range of each samples, which is typically ~8cm. All replicate measurements are included in the dataset.\r\n\r\nLee, J. E. et al. Excess methane in Greenland ice cores associated with high dust concentrations. Geochimica et cosmochimica acta 270, 409-430 (2020).", "east": -112.05, "geometry": ["POINT(-112.05 -79.28)"], "keywords": "Antarctica; Glaciers/Ice Sheet; Greenland; Ice Core Records; Methane; West Antarctic Ice Sheet", "locations": "West Antarctic Ice Sheet; Antarctica; Greenland", "north": -79.28, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Riddell-Young, Benjamin; Brook, Edward; Martin, Kaden; Rosen, Julia; Lee, James; Edwards, Jon S.", "project_titles": "Tracing Past Methane Variations with Stable Isotopes in Antarctic Ice Cores", "projects": [{"proj_uid": "p0010416", "repository": "USAP-DC", "title": "Tracing Past Methane Variations with Stable Isotopes in Antarctic Ice Cores"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -79.28, "title": "Atmospheric methane across the Last Glacial Maximum and deglaciation from the GISP2, NEEM and WAIS Divide ice cores ", "uid": "601737", "west": -112.05}, {"awards": "1745078 Brook, Edward", "bounds_geometry": ["POINT(-112.05 -79.28)"], "date_created": "Mon, 02 Oct 2023 00:00:00 GMT", "description": "This dataset includes estimates of the atmospheric methane relative interpolar difference (rIPD) across the Last Glacial Maximum and Deglaciation. The rIPD was calculated using discrete, high-resolution methane measurements from the WAIS Divide, NEEM and GISP2 ice cores. Two independent IPD records were determined: One using NEEM and WAIS and one using GISP2 and WAIS. The dataset includes rIPD values calculated using both Greenland methane data both corrected and uncorrected for excess methane (Lee et al., 2020). The rIPD was calculated by smoothing each methane record and synchronizing them to the WD2014 gas age scale. 1-sigma rIPD uncertainties are included. This dataset also includes the output of the four-box troposphere model used to interpret the rIPD. For both excess methane-corrected records, the model output and 1-sigma uncertainty is provided for northern extratropical (30N - 90N) and total tropical (30S - 30N) sources in Tg yr-1. For the NEEM-derived rIPD, sections of the rIPD where atmospheric methane changed rapidly were deemed untrustworthy were removed from the dataset.\r\n\r\nLee, J. E. et al. Excess methane in Greenland ice cores associated with high dust concentrations. Geochimica et cosmochimica acta 270, 409-430 (2020).", "east": -112.05, "geometry": ["POINT(-112.05 -79.28)"], "keywords": "Antarctica; Greenland; Methane; Paleoclimate; West Antarctic Ice Sheet", "locations": "Greenland; West Antarctic Ice Sheet; Antarctica", "north": -79.28, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Riddell-Young, Benjamin; Brook, Edward; Rosen, Julia; Buizert, Christo; Martin, Kaden; Lee, James; Edwards, Jon S.; M\u00fchl, Michaela; Schmitt, Jochen; Fischer, Hubertus; Blunier, Thomas", "project_titles": "Tracing Past Methane Variations with Stable Isotopes in Antarctic Ice Cores", "projects": [{"proj_uid": "p0010416", "repository": "USAP-DC", "title": "Tracing Past Methane Variations with Stable Isotopes in Antarctic Ice Cores"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -79.28, "title": "Atmospheric methane interpolar difference and four-box troposphere model output across the Last Glacial Maximum and Deglaciation", "uid": "601736", "west": -112.05}, {"awards": "1643716 Buizert, Christo", "bounds_geometry": ["POLYGON((-180 -67,-144 -67,-108 -67,-72 -67,-36 -67,0 -67,36 -67,72 -67,108 -67,144 -67,180 -67,180 -69.3,180 -71.6,180 -73.9,180 -76.2,180 -78.5,180 -80.8,180 -83.1,180 -85.4,180 -87.7,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87.7,-180 -85.4,-180 -83.1,-180 -80.8,-180 -78.5,-180 -76.2,-180 -73.9,-180 -71.6,-180 -69.3,-180 -67))"], "date_created": "Mon, 22 May 2023 00:00:00 GMT", "description": "We have reconstructed the atmospheric N2O mole fraction and its isotopic composition by combining data from ice cores, firn air, and atmospheric samples. The mole fraction reconstruction extends back to 1000 CE using ice cores, firn air, and atmospheric sampling; and the isotopic reconstruction extends back to 1900 CE using only firn air data. We have incorporated both newly measured and previously published data. We present new data for the mole fraction, d15Nbulk, d18O, and d15NSP values from the Styx (East Antarctica) firn air, and mole fraction from the North Greenland Eemian Ice drilling Project (NEEM) firn air. We have used published records from the Styx and NEEM ice cores, direct atmospheric measurements from the NOAA global sampling network, and firn air data, giving a total of 11 sites for N2O mole fraction, 12 sites for d15Nbulk, 11 sites for d18O, and 8 sites for d15NSP values.\r\n", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctic; Antarctica; Anthropogenic Emission; Atmosphere; Greenhouse Gas; Greenland; Ice Core Data; Nitrification and Denitrification Processes; Nitrous Oxide; Site-specific 15N isotopomer; Styx Glacier", "locations": "Antarctic; Greenland; Antarctica; Styx Glacier", "north": -67.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Ghosh, Sambit; Toyoda, Sakae ; Buizert, Christo ; Langenfelds, Ray L ; Yoshida, Naohiro ; Joong Kim, Seong; Ahn, Jinho ; Etheridge, David", "project_titles": "Collaborative Research: Reconstructing Carbon-14 of Atmospheric Carbon Monoxide from Law Dome, Antarctica to Constrain Long-Term Hydroxyl Radical Variability", "projects": [{"proj_uid": "p0010341", "repository": "USAP-DC", "title": "Collaborative Research: Reconstructing Carbon-14 of Atmospheric Carbon Monoxide from Law Dome, Antarctica to Constrain Long-Term Hydroxyl Radical Variability"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Concentration and isotopic composition of atmospheric N2O over the last century", "uid": "601693", "west": -180.0}, {"awards": "1644128 Welten, Kees; 1644094 Caffee, Marc", "bounds_geometry": ["POINT(-112.05 -79.28)"], "date_created": "Sat, 20 May 2023 00:00:00 GMT", "description": "This dataset contains a continuous depth profile of 10Be measured in ice core samples from the WAIS Divide Core between 2850 and 3240 m depth.", "east": -112.05, "geometry": ["POINT(-112.05 -79.28)"], "keywords": "10Be; Antarctica; Beryllium; Cosmogenic Radionuclides; Ice Core Data; WAIS divide", "locations": "WAIS divide; Antarctica", "north": -79.28, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Welten, Kees; Caffee, Marc; Woodruff, Thomas", "project_titles": "Synchronizing the WAIS Divide and Greenland Ice Cores from 30-65 ka BP using high-resolution 10Be measurements", "projects": [{"proj_uid": "p0010280", "repository": "USAP-DC", "title": "Synchronizing the WAIS Divide and Greenland Ice Cores from 30-65 ka BP using high-resolution 10Be measurements"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "WAIS Divide Ice Core", "south": -79.28, "title": "WAIS Divide Core 10Be data, 2850-3240 m", "uid": "601692", "west": -112.05}, {"awards": "2118315 Vieregg, Abigail; 2112352 Vieregg, Abigail; 2019597 Besson, Dave", "bounds_geometry": ["POLYGON((-180 72.5797,-158.15409 72.5797,-136.30818 72.5797,-114.46227 72.5797,-92.61636 72.5797,-70.77045 72.5797,-48.92454000000001 72.5797,-27.078630000000004 72.5797,-5.23272 72.5797,16.613190000000003 72.5797,38.4591 72.5797,38.4591 72.57968,38.4591 72.57966,38.4591 72.57964,38.4591 72.57962,38.4591 72.5796,38.4591 72.57957999999999,38.4591 72.57956,38.4591 72.57954,38.4591 72.57952,38.4591 72.5795,16.61319 72.5795,-5.23272 72.5795,-27.078629999999997 72.5795,-48.92454 72.5795,-70.77045000000001 72.5795,-92.61635999999999 72.5795,-114.46226999999999 72.5795,-136.30818 72.5795,-158.15409 72.5795,180 72.5795,165.84593 72.5795,151.69186 72.5795,137.53779 72.5795,123.38372 72.5795,109.22964999999999 72.5795,95.07558 72.5795,80.92151 72.5795,66.76744 72.5795,52.61336999999999 72.5795,38.4593 72.5795,38.4593 72.57952,38.4593 72.57954,38.4593 72.57956,38.4593 72.57957999999999,38.4593 72.5796,38.4593 72.57962,38.4593 72.57964,38.4593 72.57966,38.4593 72.57968,38.4593 72.5797,52.61337 72.5797,66.76744 72.5797,80.92151 72.5797,95.07558 72.5797,109.22965 72.5797,123.38372 72.5797,137.53779 72.5797,151.69186000000002 72.5797,165.84593 72.5797,-180 72.5797))"], "date_created": "Mon, 20 Mar 2023 00:00:00 GMT", "description": "Data collected by RNO-G collaboration, used to calculate attenuation lengths, internal layer reflectivities and bulk refractive index. LPDA transmitter on surface broadcasts ~10-ns high voltage pulse into ice and echoes recorded on similar surface LPDA. Data recorded on digital scope, after averaging 10000 triggers to elucidate weak features.\r\n\r\nFunding for this dataset was provided by NSF Grants and Deutsche Forschungsgemeinschaft (DFG, Grant NE 2031/2-1).", "east": 38.4591, "geometry": ["POINT(-141.5408 72.5796)"], "keywords": "Greenland Ice Cap", "locations": "Greenland Ice Cap", "north": 72.5797, "nsf_funding_programs": null, "persons": "Besson, Dave", "project_titles": null, "projects": null, "repositories": null, "science_programs": null, "south": 72.5795, "title": "Summer 2021 Summit Station radar echo data", "uid": "601676", "west": 38.4593}, {"awards": "2019719 Brook, Edward J.; 1841844 Steig, Eric", "bounds_geometry": null, "date_created": "Wed, 25 Jan 2023 00:00:00 GMT", "description": "This data set contains replicate measurements of D17O from a 92-m deep section of core at Summit, Greenland and other operational data necessary to reconstruct figures presented in Davidge et al., 2022. Details of the entire dataset and a description of the relevant methods can be found in Davidge et al., 2022. The names of each sheet indicate the corresponding figure numbers. The D17O record spans about two years of accumulation. Discrete measurements by laser spectroscopy are provided at 1.4-cm resolution. For the purpose of method development, continuous-flow measurements are provided with nine replicates and are averaged to multiple depth resolutions as described in Davidge et al., 2022.", "east": null, "geometry": null, "keywords": "Antarctica; Continuous Flow; Glaciology; Greenland; Ice Core Data; Laser Spectroscopy; Oxygen Isotope; Triple Oxygen Isotopes", "locations": "Greenland; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Davidge, Lindsey", "project_titles": "Center for Oldest Ice Exploration", "projects": [{"proj_uid": "p0010321", "repository": "USAP-DC", "title": "Center for Oldest Ice Exploration"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Hercules Dome Ice Core", "south": null, "title": "Replicate O-17-excess by continuous flow laser spectroscopy for an ice core section at Summit, Greenland", "uid": "601659", "west": null}, {"awards": "1921418 Yan, Stephen", "bounds_geometry": ["POLYGON((35 76,35.1 76,35.2 76,35.3 76,35.4 76,35.5 76,35.6 76,35.7 76,35.8 76,35.9 76,36 76,36 75.9,36 75.8,36 75.7,36 75.6,36 75.5,36 75.4,36 75.3,36 75.2,36 75.1,36 75,35.9 75,35.8 75,35.7 75,35.6 75,35.5 75,35.4 75,35.3 75,35.2 75,35.1 75,35 75,35 75.1,35 75.2,35 75.3,35 75.4,35 75.5,35 75.6,35 75.7,35 75.8,35 75.9,35 76))"], "date_created": "Wed, 08 Dec 2021 00:00:00 GMT", "description": "This dataset includes a preliminary 1-km line of L-band radar data near the East Greenland Ice core Project. The data have been pulse compressed and focused using a simple Doppler focusing algorithm.", "east": 36.0, "geometry": ["POINT(35.5 75.5)"], "keywords": "Antarctica; Greenland", "locations": "Greenland; Antarctica", "north": 76.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Taylor, Drew; Gogineni, Prasad; O\u0027Neill, Charles; Taylor, Ryan", "project_titles": "EAGER: L-Band Radar Ice Sounder for Measuring Ice Basal Conditions and Ice-Shelf Melt Rate", "projects": [{"proj_uid": "p0010271", "repository": "USAP-DC", "title": "EAGER: L-Band Radar Ice Sounder for Measuring Ice Basal Conditions and Ice-Shelf Melt Rate"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": 75.0, "title": "2019 initial L-band radar data for EGRIP", "uid": "601488", "west": 35.0}, {"awards": "1246353 Anderson, John; 1745043 Simkins, Lauren; 1745055 Stearns, Leigh", "bounds_geometry": ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"], "date_created": "Wed, 10 Nov 2021 00:00:00 GMT", "description": "The dataset here allows exploration of the causes and significance of Antarctic grounding-line sinuosity by coupling observations of contemporary Antarctic grounding lines and paleo-grounding lines expressed as ice-marginal landforms on the Ross Sea continental shelf. Modern grounding lines are derived from the MEaSUREs Version 2 Differential Satellite Radar Interferometry dataset with spatial resolutions of 25-120 m spanning February 1992 to December 2014 (Rignot et al., 2016; Mouginot et al., 2017). The boundaries of individual grounding lines representative of individual glacial catchments (n=664) were delineated by the inflection points of the shear strain rate, \u03b5xy (c.f Van der Veen et al., 2011). Sinuosity was calculated as the ratio of the true length, orthogonal to ice-flow direction, of the grounding lines and the straight line length between end-points and in units of km/km. Raster data were extracted at 1-km points along each grounding line; the mean was calculated for each grounding line and merged in a table with sinuosity data. A dataset of 6,275 paleo-grounding lines expressed as ice-marginal landforms on the deglaciated western Ross Sea continental shelf are used in this study, originally published by Simkins et al., 2018. The ice-marginal landforms were mapped from multibeam echo sounder data that was collected onboard the RVIB Nathaniel B. Palmer (NBP) 15-02 cruise using a Kongsberg EM122 operating in dual swath mode at 12 kHz frequency with 30-60% swath overlap (Cruise DOI: 10.7284/901477). The resulting bathymetry data was gridded at 20-40 m with decimeter vertical elevation resolution depending on water depth and sea-state. Sinuosity is calculated as a ratio of true (mapped) landform length, measured in the across paleo-ice flow direction at the crest of the landform, to the straight line distance between the mapped landform endpoints and in units of km/km. \r\n\r\nTo compare modern and paleo-grounding lines, we use a consistent length scale by segmenting the grounding lines into 2-km sections for the two datasets (modern, n=12,966; paleo, n=5,832), even though this eliminates grounding lines that are less than 2-km long and thus results in 1 modern and 3,873 paleo-grounding lines removed. The full-length and 2-km segmented groundings lines are provided as shapefiles \"InSAR_groundinglines_full\" and \"InSAR_groundinglines_2km\", the paleo-grounding lines are provided as shapefiles \"RossSea_icemarginal_full\" and \"RossSea_icemarginal_2km\", and points marking modern grounding lines retreat from repeat InSAR surveys are provided as shapefile \"InSAR_retreat_points\", all stored together in a geodatabase named \"Antarctic_groundinglines.gbd\". Additional grounding line metrics, including length, sinuosity, bed roughness, and bed slope for modern and paleo-grounding lines, and height-above-buoyancy gradient, ice-flow velocity, presence of pinning points and ice shelves are provided for modern grounding lines. \r\n\r\nThe published dataset was compiled and analyzed in the article \"Controls on circum-Antarctic grounding-line sinuosity \" by Simkins, L.M., Stearns, L.A., and Riverman, K.L, which will be submitted to a peer-review journal in November 2021.\r\n\r\nReferences\r\nMouginot, J., B. Scheuchl, and E. Rignot. 2017. MEaSUREs Antarctic Boundaries for IPY 2007-2009 from Satellite Radar, Version 2. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. \r\n\r\nRignot, E., J. Mouginot, and B. Scheuchl. 2016. MEaSUREs Antarctic Grounding Line from Differential Satellite Radar Interferometry, Version 2. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. \r\n\r\nSimkins, L. M., Greenwood, S. L., \u0026 Anderson, J. B. (2018). Diagnosing ice sheet grounding line stability from landform morphology. The Cryosphere, 12(8), 2707-2726.\r\n\r\nVan der Veen, C. J., J. C. Plummer, \u0026 L. A. Stearns. (2011). Controls on the recent speed up of Jakobshavn Isbr\u00e6, West Greenland. Journal of Glaciology, 57(204), 770-782", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctica; Bed Roughness; Bed Slope; Elevation; Glaciers/Ice Sheet; Pinning Points", "locations": "Antarctica; Antarctica", "north": -60.0, "nsf_funding_programs": "Antarctic Earth Sciences; Antarctic Earth Sciences; Antarctic Earth Sciences", "persons": "Simkins, Lauren; Stearns, Leigh; Riverman, Kiya", "project_titles": "Collaborative Research: Topographic controls on Antarctic Ice Sheet grounding line retreat - integrating models and observations; Evidence for Paleo Ice Stream Collapse in the Western Ross Sea since the Last Glacial Maximum.", "projects": [{"proj_uid": "p0000395", "repository": "USAP-DC", "title": "Evidence for Paleo Ice Stream Collapse in the Western Ross Sea since the Last Glacial Maximum."}, {"proj_uid": "p0010269", "repository": "USAP-DC", "title": "Collaborative Research: Topographic controls on Antarctic Ice Sheet grounding line retreat - integrating models and observations"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Circum-Antarctic grounding-line sinuosity", "uid": "601484", "west": -180.0}, {"awards": "1543441 Fricker, Helen; 1656518 Gumport, Patricia", "bounds_geometry": null, "date_created": "Tue, 14 Sep 2021 00:00:00 GMT", "description": "This dataset includes raw, uncalibrated voltage vs time measurements from a bistatic radar receiver. We also include some processed data including upsampled matched filtered data, GPS receiver position, antenna separation", "east": null, "geometry": null, "keywords": "Antarctica; Bistatic Radar; Glaciers/Ice Sheet; Glaciology; GPS Data; Greenland; Lake Whillans; Radar; Store Glacier; Whillans Ice Stream; WISSARD", "locations": "Whillans Ice Stream; Store Glacier; Greenland; Lake Whillans; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Integrated System Science; Antarctic Integrated System Science", "persons": "Bienert, Nicole; Schroeder, Dustin; Siegfried, Matthew; Peters, Sean; MacKie, Emma; Dawson, Eliza; Christoffersen, Poul", "project_titles": "Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments", "projects": [{"proj_uid": "p0010119", "repository": "USAP-DC", "title": "Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "WISSARD", "south": null, "title": "Bistatic Radar Sounding of Whillans Ice Stream, Antarctica and Store Glacier, Greenland", "uid": "601472", "west": null}, {"awards": "1443448 Schaefer, Joerg; 1443144 Steig, Eric", "bounds_geometry": ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"], "date_created": "Wed, 03 Feb 2021 00:00:00 GMT", "description": "Experiments were conducted using ECHAM5-HAM atmospheric aerosol - climate model at horizontal resolution of T42 (~2.8\u00b0 latitude \u00d7 2.8\u00b0 longitude) with 19 vertical levels to examine the relationship between the production of 10Be in the atmosphere and its deposition at the surface. Five experiments were conducted, using a) constant 10Be production but varying, observed climate b) climatological climate of the last 50 years but varying 10Be production, c) constant 10Be production with 50-years of varying climate for 0 ka, (d) 6 ka, and (e) 21 ka, using the TraCE21 simulation to provide boundary conditions. The results will be useful for comparison with 10Be concentration records obtained from the South Pole ice core and other Antarctic and Greenland records.", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctica; South Pole", "locations": "South Pole; Antarctica; Antarctica", "north": -60.0, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Ding, Qinghua; Schaefer, Joerg; Steig, Eric J.", "project_titles": "Collaborative Research: A High-sensitivity Beryllium-10 Record from an Ice Core at South Pole", "projects": [{"proj_uid": "p0010158", "repository": "USAP-DC", "title": "Collaborative Research: A High-sensitivity Beryllium-10 Record from an Ice Core at South Pole"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "SPICEcore", "south": -90.0, "title": "Simulations of 10Be over Antarctica", "uid": "601431", "west": -180.0}, {"awards": "1543229 Severinghaus, Jeffrey; 1543267 Brook, Edward", "bounds_geometry": ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"], "date_created": "Thu, 22 Oct 2020 00:00:00 GMT", "description": "Stable isotope ratios of atmospheric krypton, argon, nitrogen and oxygen were measured in late-Holocene ice core samples from nine sites in Antarctica and Greenland, for the purpose of calibrating the Kr-86 excess proxy as defined in Buizert and Severinghaus (2016).", "east": 180.0, "geometry": ["POINT(0 -89.999)"], "keywords": "Antarctica; Bruce Plateau; Glaciers/Ice Sheet; Glaciology; Greenland Ice Cap; Ice Core; Ice Core Chemistry; Ice Core Records; James Ross Island; Krypton; Law Dome; Low Dome Ice Core; Roosevelt Island; Siple Dome; Siple Dome Ice Core; South Pole; SPICEcore; WAIS divide; WAIS Divide Ice Core", "locations": "WAIS divide; South Pole; Siple Dome; Law Dome; Roosevelt Island; Greenland Ice Cap; James Ross Island; Bruce Plateau; Antarctica", "north": -60.0, "nsf_funding_programs": "Antarctic Glaciology; Antarctic Glaciology", "persons": "Buizert, Christo; Shackleton, Sarah; Severinghaus, Jeffrey P.; Brook, Edward J.; Baggenstos, Daniel; Bereiter, Bernhard; Etheridge, David; Bertler, Nancy; Pyne, Rebecca L.; Mulvaney, Robert; Mosley-Thompson, Ellen", "project_titles": "Collaborative research: Kr-86 as a proxy for barometric pressure variability and movement of the SH westerlies during the last\r\ndeglaciation", "projects": [{"proj_uid": "p0010037", "repository": "USAP-DC", "title": "Collaborative research: Kr-86 as a proxy for barometric pressure variability and movement of the SH westerlies during the last\r\ndeglaciation"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "WAIS Divide Ice Core; SPICEcore; Siple Dome Ice Core", "south": -90.0, "title": "Multi-site ice core Krypton stable isotope ratios", "uid": "601394", "west": -180.0}, {"awards": "1745116 Scambos, Ted", "bounds_geometry": ["POLYGON((-72 -70.75,-71.95 -70.75,-71.9 -70.75,-71.85 -70.75,-71.8 -70.75,-71.75 -70.75,-71.7 -70.75,-71.65 -70.75,-71.6 -70.75,-71.55 -70.75,-71.5 -70.75,-71.5 -70.775,-71.5 -70.8,-71.5 -70.825,-71.5 -70.85,-71.5 -70.875,-71.5 -70.9,-71.5 -70.925,-71.5 -70.95,-71.5 -70.975,-71.5 -71,-71.55 -71,-71.6 -71,-71.65 -71,-71.7 -71,-71.75 -71,-71.8 -71,-71.85 -71,-71.9 -71,-71.95 -71,-72 -71,-72 -70.975,-72 -70.95,-72 -70.925,-72 -70.9,-72 -70.875,-72 -70.85,-72 -70.825,-72 -70.8,-72 -70.775,-72 -70.75))"], "date_created": "Wed, 21 Oct 2020 00:00:00 GMT", "description": "This dataset compiles a suite of glaciology (density, stratigraphy), hydrology (slug and dilution tests) and geophysical measurements (GPS, GPR, ApRES) to characterize a firn aquifer observed within the Wilkins Ice Shelf, Antarctica.", "east": -71.5, "geometry": ["POINT(-71.75 -70.875)"], "keywords": "Airborne Radar; Antarctica; Antarctic Peninsula; Firn; Firn Aquifer; Glaciers/Ice Sheet; Glaciology; GPR; Hydrology; Snow/Ice; Wilkins Ice Shelf", "locations": "Antarctic Peninsula; Wilkins Ice Shelf; Wilkins Ice Shelf; Antarctica", "north": -70.75, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Mi\u00e8ge, Cl\u00e9ment; Montgomery, Lynn; Miller, Julie; Scambos, Ted; Wallin, Bruce; Miller, Olivia; Solomon, Kip; Forster, Richard; Koenig, Lora", "project_titles": "Antarctic Firn Aquifers: Extent, Characteristics, and Comparison with Greenland Occurrences", "projects": [{"proj_uid": "p0010126", "repository": "USAP-DC", "title": "Antarctic Firn Aquifers: Extent, Characteristics, and Comparison with Greenland Occurrences"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -71.0, "title": "Density, hydrology and geophysical measurements from the Wilkins Ice Shelf firn aquifer", "uid": "601390", "west": -72.0}, {"awards": "1043518 Brook, Edward", "bounds_geometry": ["POLYGON((-113 -79,-112.8 -79,-112.6 -79,-112.4 -79,-112.2 -79,-112 -79,-111.8 -79,-111.6 -79,-111.4 -79,-111.2 -79,-111 -79,-111 -79.1,-111 -79.2,-111 -79.3,-111 -79.4,-111 -79.5,-111 -79.6,-111 -79.7,-111 -79.8,-111 -79.9,-111 -80,-111.2 -80,-111.4 -80,-111.6 -80,-111.8 -80,-112 -80,-112.2 -80,-112.4 -80,-112.6 -80,-112.8 -80,-113 -80,-113 -79.9,-113 -79.8,-113 -79.7,-113 -79.6,-113 -79.5,-113 -79.4,-113 -79.3,-113 -79.2,-113 -79.1,-113 -79))"], "date_created": "Mon, 11 Sep 2017 00:00:00 GMT", "description": "Below we present the early Holocene discrete CH4 dataset from Siple Dome (SDMA), Antarctica, measured at Oregon State University (OSU) and Seoul National University (SNU) by discrete wet extraction technique. Analytical method is described in Grachev et al. (2009) and Mitchell et al. (2011) for OSU data, and Yang et al. (2017) for SNU data. SDMA CH4 composite record was constructed by combining OSU data for 7.6 - 9.0 ka and SNU data for 9.0 - 11.6 ka to maximize temporal resolution. SDMA gas chronology was synchronized to Greenland Ice Core Chronology 2005 (GICC05) scale. For detailed description on synchronization and age uncertainty please refer to Yang et al. (2017).", "east": -111.0, "geometry": ["POINT(-112 -79.5)"], "keywords": "Antarctica; Chemistry:Ice; Geochemistry; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Methane; Paleoclimate; Siple Dome; Siple Dome Ice Core", "locations": "Siple Dome; Antarctica", "north": -79.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Yang, Ji-Woong; Ahn, Jinho", "project_titles": "Collaborative Research: Completing an ultra-high resolution methane record from the WAIS Divide ice core", "projects": [{"proj_uid": "p0000185", "repository": "USAP-DC", "title": "Collaborative Research: Completing an ultra-high resolution methane record from the WAIS Divide ice core"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "WAIS Divide Ice Core; Siple Dome Ice Core", "south": -80.0, "title": "Early Holocene methane records from Siple Dome, Antarctica", "uid": "601055", "west": -113.0}, {"awards": "0944197 Waddington, Edwin", "bounds_geometry": ["POINT(-112.1115 -79.481)"], "date_created": "Tue, 28 Mar 2017 00:00:00 GMT", "description": "The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ~68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP) have been dated using annual-layer counting. Here we present a chronology for the deep part of the core (67.8-31.2 ka BP), which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WD gas age-ice age difference (Delta age) using a combination of firn densification modeling, ice-flow modeling, and a data set of d15N-N2, a proxy for past firn column thickness. The largest Delta age at WD occurs during the Last Glacial Maximum, and is 525 +/- 120 years. Internally consistent solutions can be found only when assuming little to no influence of impurity content on densification rates, contrary to a recently proposed hypothesis. We synchronize the WD chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05), which brings the age of Dansgaard-Oeschger (DO) events into agreement with the U/Th absolutely dated Hulu Cave speleothem record. The small Delta age at WD provides valuable opportunities to investigate the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the \\\"bipolar seesaw\\\".\n\nWe present the WD2014 chronology for the upper part (0-2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing to two high-accuracy, absolutely dated chronologies. For the Holocene, the cosmogenic isotope records of 10Be from WAIS Divide and 14C for IntCal13 demonstrated that WD2014 was consistently accurate to better than 0.5% of the age. For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1% of the age at three abrupt climate change events between 27 and 31ka. WD2014 has consistently younger ages than Greenland ice core chronologies during most of the Holocene. For the Younger Dryas-Preboreal transition (11.595 ka; 24 years younger) and the Bolling-Allerod Warming (14.621 ka; 7 years younger), WD2014 ages are within the combined uncertainties of the timescales. Given its high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere, with synchronization to other chronologies feasible using high-quality proxies of volcanism, solar activity, atmospheric mineral dust, and atmospheric methane concentrations.", "east": -112.1115, "geometry": ["POINT(-112.1115 -79.481)"], "keywords": "Antarctica; Depth-Age-Model; Geochronology; Glaciers/Ice Sheet; Glaciology; Ice Core Records; WAIS divide; WAIS Divide Ice Core", "locations": "WAIS divide; Antarctica", "north": -79.481, "nsf_funding_programs": null, "persons": "Fudge, T. J.", "project_titles": "Collaborative Research: Establishing the Chronology and Histories of Accumulation and Ice Dynamics for the WAIS Divide Core", "projects": [{"proj_uid": "p0000026", "repository": "USAP-DC", "title": "Collaborative Research: Establishing the Chronology and Histories of Accumulation and Ice Dynamics for the WAIS Divide Core"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "WAIS Divide Ice Core", "south": -79.481, "title": "WD2014: Timescale for WAIS Divide Core 2006 A (WDC-06A)", "uid": "601015", "west": -112.1115}, {"awards": "0839031 Severinghaus, Jeffrey", "bounds_geometry": ["POINT(161.71965 -77.76165)"], "date_created": "Fri, 01 Jan 2016 00:00:00 GMT", "description": "This award supports a project to develop a precise gas-based chronology for an archive of large-volume samples of the ancient atmosphere, which would enable ultra-trace gas measurements that are currently precluded by sample size limitations of ice cores. The intellectual merit of the proposed work is that it will provide a critical test of the \u0027clathrate hypothesis\u0027 that methane clathrates contributed to the two abrupt atmospheric methane concentration increases during the last deglaciation 15 and 11 kyr ago. This approach employs large volumes of ice (\u003e1 ton) to measure carbon-14 on past atmospheric methane across the abrupt events. Carbon-14 is an ideal discriminator of fossil sources of methane to the atmosphere, because most methane sources (e.g., wetlands, termites, biomass burning) are rich in carbon-14, whereas clathrates and other fossil sources are devoid of carbon-14. The proposed work is a logical extension to Taylor Glacier, Antarctica, of an approach pioneered at the margin of the Greenland ice sheet over the past 7 years. The Greenland work found higher-than-expected carbon-14 values, likely due in part to contaminants stemming from the high impurity content of Greenland ice and the interaction of the ice with sediments from the glacier bed. The data also pointed to the possibility of a previously unknown process, in-situ cosmogenic production of carbon-14 methane (radiomethane) in the ice matrix. Antarctic ice in Taylor Glacier is orders of magnitude cleaner than the ice at the Greenland site, and is much colder and less stratigraphically disturbed, offering the potential for a clear resolution of this puzzle and a definitive test of the cosmogenic radiomethane hypothesis. Even if cosmogenic radiomethane in ice is found, it still may be possible to reconstruct atmospheric radiomethane with a correction enabled by a detailed understanding of the process, which will be sought by co-measuring carbon-14 in carbon monoxide and carbon dioxide. The broader impacts of the proposed work are that the clathrate test may shed light on the stability of the clathrate reservoir and its potential for climate feedbacks under human-induced warming. Development of Taylor Glacier as a \u0027horizontal ice core\u0027 would provide a community resource for other researchers. Education of one postdoc, one graduate student, and one undergraduate, would add to human resources. This award has field work in Antarctica.", "east": 161.71965, "geometry": ["POINT(161.71965 -77.76165)"], "keywords": "Antarctica; Cosmogenic; Geochemistry; Ice Core Records; Paleoclimate; Radiocarbon; Taylor Glacier; Transantarctic Mountains", "locations": "Taylor Glacier; Transantarctic Mountains; Antarctica", "north": -77.76165, "nsf_funding_programs": null, "persons": "Severinghaus, Jeffrey P.", "project_titles": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica", "projects": [{"proj_uid": "p0000099", "repository": "USAP-DC", "title": "Collaborative Research: A \"Horizontal Ice Core\" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -77.76165, "title": "Measurements of in situ cosmogenic 14C from Taylor Glacier, Antarctica", "uid": "600165", "west": 161.71965}, {"awards": "0934534 Sergienko, Olga", "bounds_geometry": ["POLYGON((-75 84,-69.5 84,-64 84,-58.5 84,-53 84,-47.5 84,-42 84,-36.5 84,-31 84,-25.5 84,-20 84,-20 81.6,-20 79.2,-20 76.8,-20 74.4,-20 72,-20 69.6,-20 67.2,-20 64.8,-20 62.4,-20 60,-25.5 60,-31 60,-36.5 60,-42 60,-47.5 60,-53 60,-58.5 60,-64 60,-69.5 60,-75 60,-75 62.4,-75 64.8,-75 67.2,-75 69.6,-75 72,-75 74.4,-75 76.8,-75 79.2,-75 81.6,-75 84))", "POLYGON((-150 -75,-129 -75,-108 -75,-87 -75,-66 -75,-45 -75,-24 -75,-3 -75,18 -75,39 -75,60 -75,60 -76.5,60 -78,60 -79.5,60 -81,60 -82.5,60 -84,60 -85.5,60 -87,60 -88.5,60 -90,39 -90,18 -90,-3 -90,-24 -90,-45 -90,-66 -90,-87 -90,-108 -90,-129 -90,-150 -90,-150 -88.5,-150 -87,-150 -85.5,-150 -84,-150 -82.5,-150 -81,-150 -79.5,-150 -78,-150 -76.5,-150 -75))"], "date_created": "Tue, 07 Jul 2015 00:00:00 GMT", "description": "This data set includes basal shear distributions inferred from surface observations - surface ice velocities (Joughin et al., 2010, Rignot et al., 2011), bed and surface elevations (Fretwell et al., 2013) under ten selected locations in Greenland and Antarctica. In Greenland, the locations were: 79\u00b0 North and Zachariae Glaciers, Jakobshan Isbrae, North East Greenland Ice Stream, Petermann Glacier. The Antarctica locations were Bindschadler Ice Stream, Lambert Ice Stream, MacAyeal Ice Stream, Pine Island Glacier, Thwaites Glacier, and an unnamed location around ~40\u00b0 E 84\u00b0 S.", "east": 60.0, "geometry": ["POINT(-47.5 72)", "POINT(-45 -82.5)"], "keywords": "Antarctica; Arctic; Bindschadler Ice Stream; Glaciers/Ice Sheet; Glaciology; Greenland; Lambert Ice Stream; MacAyeal Ice Stream; Pine Island Glacier; Thwaites Glacier", "locations": "Bindschadler Ice Stream; Greenland; MacAyeal Ice Stream; Pine Island Glacier; Thwaites Glacier; Lambert Ice Stream; Antarctica", "north": 84.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Sergienko, Olga", "project_titles": "COLLABORATIVE RESEARCH: Enabling ice sheet sensitivity and stability analysis with a large-scale higher-order ice sheet model\u0027s adjoint to support sea level change assessment", "projects": [{"proj_uid": "p0000048", "repository": "USAP-DC", "title": "COLLABORATIVE RESEARCH: Enabling ice sheet sensitivity and stability analysis with a large-scale higher-order ice sheet model\u0027s adjoint to support sea level change assessment"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Inverted Basal Shear Stress of Antarctic and Greenland Ice Streams and Glaciers", "uid": "609626", "west": -150.0}, {"awards": "1043485 Curtice, Josh", "bounds_geometry": ["POLYGON((163.4 -77.47989,163.9848 -77.47989,164.5696 -77.47989,165.1544 -77.47989,165.7392 -77.47989,166.324 -77.47989,166.9088 -77.47989,167.4936 -77.47989,168.0784 -77.47989,168.6632 -77.47989,169.248 -77.47989,169.248 -77.565701,169.248 -77.651512,169.248 -77.737323,169.248 -77.823134,169.248 -77.908945,169.248 -77.994756,169.248 -78.080567,169.248 -78.166378,169.248 -78.252189,169.248 -78.338,168.6632 -78.338,168.0784 -78.338,167.4936 -78.338,166.9088 -78.338,166.324 -78.338,165.7392 -78.338,165.1544 -78.338,164.5696 -78.338,163.9848 -78.338,163.4 -78.338,163.4 -78.252189,163.4 -78.166378,163.4 -78.080567,163.4 -77.994756,163.4 -77.908945,163.4 -77.823134,163.4 -77.737323,163.4 -77.651512,163.4 -77.565701,163.4 -77.47989))"], "date_created": "Thu, 01 Jan 2015 00:00:00 GMT", "description": "This award supports a project to develop a better understanding of the response of the WAIS to climate change. The timing of the last deglaciation of the western Ross Sea will be improved using in situ terrestrial cosmogenic nuclides (3He, 10Be, 14C, 26Al, 36Cl) to date glacial erratics at key areas and elevations along the western Ross Sea coast. A state-of-the art ice sheet-shelf model will be used to identify mechanisms of deglaciation of the Ross Sea sector of WAIS. The model results and forcing will be compared with observations including the new cosmogenic data proposed here, with the aim of better determining and understanding the history and causes of WAIS deglaciation in the Ross Sea. There is considerable uncertainty, however, in the history of grounding line retreat from its last glacial maximum position, and virtually nothing is known about the timing of ice- surface lowering prior to ~10,000 years ago. Given these uncertainties, we are currently unable to assess one of the most important questions regarding the last deglaciation of the global ice sheets, namely as to whether the Ross Sea sector of WAIS contributed significantly to meltwater pulse 1A (MWP-1A), an extraordinarily rapid (~500-year duration) episode of ~20 m sea-level rise that occurred ~14,500 years ago. The intellectual merit of this project is that recent observations of startling changes at the margins of the Greenland and Antarctic ice sheets indicate that dynamic responses to warming may play a much greater role in the future mass balance of ice sheets than considered in current numerical projections of sea level rise. The broader impacts of this work are that it has direct societal relevance to developing an improved understanding of the response of the West Antarctic ice sheet to current and possible future environmental changes including the sea-level response to glacier and ice sheet melting due to global warming. The PI will communicate results from this project to a variety of audiences through the publication of peer-reviewed papers and by giving talks to public audiences. Finally the project will support a graduate student and undergraduate students in all phases of field-work, laboratory work and data interpretation.\n", "east": 169.248, "geometry": ["POINT(166.324 -77.908945)"], "keywords": "Antarctica; Cosmogenic Dating; Ross Sea; Sample/Collection Description; Southern Ocean; WAIS", "locations": "WAIS; Ross Sea; Antarctica; Southern Ocean", "north": -77.47989, "nsf_funding_programs": null, "persons": "Kurz, Mark D.; Curtice, Josh", "project_titles": "Collaborative Research: A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea", "projects": [{"proj_uid": "p0000194", "repository": "USAP-DC", "title": "Collaborative Research: A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -78.338, "title": "A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea", "uid": "600123", "west": 163.4}, {"awards": "0944248 MacAyeal, Douglas", "bounds_geometry": ["POLYGON((-63 -63,-62.2 -63,-61.4 -63,-60.6 -63,-59.8 -63,-59 -63,-58.2 -63,-57.4 -63,-56.6 -63,-55.8 -63,-55 -63,-55 -63.4,-55 -63.8,-55 -64.2,-55 -64.6,-55 -65,-55 -65.4,-55 -65.8,-55 -66.2,-55 -66.6,-55 -67,-55.8 -67,-56.6 -67,-57.4 -67,-58.2 -67,-59 -67,-59.8 -67,-60.6 -67,-61.4 -67,-62.2 -67,-63 -67,-63 -66.6,-63 -66.2,-63 -65.8,-63 -65.4,-63 -65,-63 -64.6,-63 -64.2,-63 -63.8,-63 -63.4,-63 -63))"], "date_created": "Tue, 29 Apr 2014 00:00:00 GMT", "description": "This data set addresses why surface melt water lakes on ice shelves and ice sheets are notably influential in triggering ice-shelf break-up and modulating seasonal ice flow, and are thus principle avenues by which environmental change can be transmitted to the ice sheets of Antarctica and Greenland. A comparative analysis is performed of lake geometry and derived depth (using Landsat image reflectance) in two distinct regions, one a collapsing ice shelf and the other an ablation zone of a land terminating ice sheet, to better characterize the range of surface lake variability.", "east": -55.0, "geometry": ["POINT(-59 -65)"], "keywords": "Antarctica; Antarctic Peninsula; Glaciers/Ice Sheet; Glaciology; Ice Shelf; Larsen B Ice Shelf; Sample/Collection Description; Supraglacial Meltwater", "locations": "Antarctic Peninsula; Larsen B Ice Shelf; Antarctica", "north": -63.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "MacAyeal, Douglas", "project_titles": "Model Studies of Surface Water Behavior on Ice Shelves", "projects": [{"proj_uid": "p0000052", "repository": "USAP-DC", "title": "Model Studies of Surface Water Behavior on Ice Shelves"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -67.0, "title": "Standing Water Depth on Larsen B Ice Shelf", "uid": "609584", "west": -63.0}, {"awards": "0538578 Brook, Edward; 0538538 Sowers, Todd; 0944584 Sowers, Todd", "bounds_geometry": ["POINT(-38.5 72.6)", "POINT(-112.0865 -79.4676)"], "date_created": "Fri, 31 Jan 2014 00:00:00 GMT", "description": "This data set measures methane concentrations in ancient air trapped in the West Antarctic Ice Sheet (WAIS) Divide and Greenland Ice Sheet Project (GISP2) ice cores; presenting two, high-resolution ice core methane records of the past 2500 years, one from each pole. These measurements were used to reconstruct the methane Inter-Polar Difference (IPD) during the late Holocene. Also included are model results of methane emissions that were presented in the manuscript describing this data set.", "east": -38.5, "geometry": ["POINT(-38.5 72.6)", "POINT(-112.0865 -79.4676)"], "keywords": "Antarctica; Arctic; Chemistry:Fluid; Geochemistry; GISP2; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Methane; Paleoclimate; WAIS divide; WAIS Divide Ice Core", "locations": "WAIS divide; Antarctica", "north": 72.6, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Mitchell, Logan E", "project_titles": "Collaborative Research: Constructing an Ultra-high Resolution Atmospheric Methane Record for the Last 140,000 Years from WAIS Divide Core.", "projects": [{"proj_uid": "p0000025", "repository": "USAP-DC", "title": "Collaborative Research: Constructing an Ultra-high Resolution Atmospheric Methane Record for the Last 140,000 Years from WAIS Divide Core."}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "WAIS Divide Ice Core", "south": -79.4676, "title": "Late Holocene Methane Concentrations from WAIS Divide and GISP2", "uid": "609586", "west": -112.0865}, {"awards": "0739598 Aydin, Murat", "bounds_geometry": ["POINT(112.09 -79.47)", "POINT(0 -90)", "POINT(-38.3833 72.5833)"], "date_created": "Wed, 30 Nov 2011 00:00:00 GMT", "description": "This data set contains ethane, propane, and n-butane measurements in firn air from the South Pole and the West Antarctic Ice Sheet (WAIS) Divide in Antarctica, and from Summit, Greenland. The WAIS Divide and South Pole samples were collected in December to January of of 2005/06 and 2008/09, respectively. The Summit firn was sampled in the summer of 2006. Analyses were conducted on a gas chromatography - mass spectrometry (GC-MS) system at the University of California, Irvine. Measurements and the associated uncertainties are reported as dry air molar mixing ratios in part per trillion (ppt). The reported measurements for each sampling depth represent a mean of multiple measurements on more than one flask in most cases.\n\nData are available via FTP in Microsoft Excel (.xls) format.", "east": 112.09, "geometry": ["POINT(112.09 -79.47)", "POINT(0 -90)", "POINT(-38.3833 72.5833)"], "keywords": "Antarctica; Arctic; Atmosphere; Chemistry:Fluid; Geochemistry; Glaciers/Ice Sheet; Greenland; Snow/Ice; South Pole; WAIS divide", "locations": "Greenland; South Pole; WAIS divide; Antarctica", "north": 72.5833, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Aydin, Murat; Saltzman, Eric", "project_titles": "Collaborative Research: Methane Isotopes, Hydrocarbons, and other Trace Gases in South Pole Firn Air", "projects": [{"proj_uid": "p0000162", "repository": "USAP-DC", "title": "Collaborative Research: Methane Isotopes, Hydrocarbons, and other Trace Gases in South Pole Firn Air"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -90.0, "title": "Alkanes in Firn Air Samples, Antarctica and Greenland", "uid": "609504", "west": -38.3833}, {"awards": "0440523 Baker, Ian; 9980379 Baker, Ian", "bounds_geometry": ["POINT(-38.466667 72.583333)", "POINT(-119.516667 -80.016667)", "POINT(106.8 -72.466667)"], "date_created": "Mon, 15 Feb 2010 00:00:00 GMT", "description": "This data set contains measurements of impurities and ions in three polar ice cores: the Vostok 5G ice core and the Byrd ice core from Antarctica, and the Greenland Ice Sheet Project 2 (GISP2) D core. Parameters include sample depth, grain size, ion concentration, and ice core impurity information. Measurements were made using Ion Chromatography (IC), optical microscopy, and Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM/EDS). \n\nData are available via FTP in Microsoft Excel (.xls)and Microsoft Word (.doc) formats.", "east": 106.8, "geometry": ["POINT(-38.466667 72.583333)", "POINT(-119.516667 -80.016667)", "POINT(106.8 -72.466667)"], "keywords": "Antarctica; Arctic; Byrd Glacier; Byrd Ice Core; Chemistry:Ice; Geochemistry; GISP2; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Lake Vostok; Paleoclimate; Vostok Ice Core", "locations": "Lake Vostok; Byrd Glacier; Antarctica", "north": 72.583333, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Baker, Ian; Obbard, Rachel", "project_titles": "The Physical Properties of the US ITASE Firn and Ice Cores from South Pole to Taylor Dome", "projects": [{"proj_uid": "p0000289", "repository": "USAP-DC", "title": "The Physical Properties of the US ITASE Firn and Ice Cores from South Pole to Taylor Dome"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -80.016667, "title": "Microstructural Location and Composition of Impurities in Polar Ice Cores", "uid": "609436", "west": -119.516667}, {"awards": "0520523 Brook, Edward J.", "bounds_geometry": ["POINT(-38.466667 73.583333)", "POINT(-148.81 -81.65)"], "date_created": "Wed, 09 Dec 2009 00:00:00 GMT", "description": "This data set contains methane measurements made in trapped air in the Holocene sections of two ice cores: the Siple Dome ice core in Antarctica, and the Greenland Ice Sheet Project 2 (GISP2) ice core in Greenland. The measurements were made at Oregon State University between 2007 and 2009. Measurements were made relative to the NOAA04 methane concentration scale using a working standard internally calibrated to NOAA certified air standards. Concentrations are corrected for gravitational fractionation and solubility effects in the melt-refreeze extraction. Data are available via FTP in Microsoft Excel (.xls) format.", "east": -38.466667, "geometry": ["POINT(-38.466667 73.583333)", "POINT(-148.81 -81.65)"], "keywords": "Antarctica; Arctic; Chemistry:Fluid; Geochemistry; GISP2; Glaciers/Ice Sheet; Ice Core Records; Paleoclimate; Siple Dome; Siple Dome Ice Core", "locations": "Siple Dome; Antarctica", "north": 73.583333, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Brook, Edward J.", "project_titles": "Collaborative Research: New insights into the Holocene methane budget from dual isotope systematics and a high resolution record of the interpolar gradient", "projects": [{"proj_uid": "p0000131", "repository": "USAP-DC", "title": "Collaborative Research: New insights into the Holocene methane budget from dual isotope systematics and a high resolution record of the interpolar gradient"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Siple Dome Ice Core", "south": -81.65, "title": "Methane Measurements from the GISP2 and Siple Dome Ice Cores", "uid": "609440", "west": -148.81}, {"awards": "0440975 Severinghaus, Jeffrey", "bounds_geometry": ["POINT(-119.533333 -80.016667)"], "date_created": "Fri, 17 Jul 2009 00:00:00 GMT", "description": "This data set consists of Gas-isotopic data from the Siple Dome and and Greenland Ice Sheet Project 2 (GISP2) ice cores covering roughly the last 100,000 years (100 ka), consisting of d15N (15N/14N) of N2, d18O (18O/16O) of O2, dO2/N2, and dAr/N2. Derived parameters include d18Oatm, d15N, dO2/N2, and dAr/N2. \n\nData are available via FTP as ASCII text files (.txt) and Microsoft Excel files (.xls).", "east": -119.533333, "geometry": ["POINT(-119.533333 -80.016667)"], "keywords": "Antarctica; Arctic; Atmosphere; Byrd Glacier; Byrd Ice Core; Chemistry:Fluid; Geochemistry; GISP2; Glaciers/Ice Sheet; Ice Core Records; Isotope; Paleoclimate; Siple Dome; Siple Dome Ice Core", "locations": "Siple Dome; Byrd Glacier; Antarctica", "north": -80.016667, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Severinghaus, Jeffrey P.", "project_titles": "Nitrogen and oxygen gas isotopes in the Siple Dome and Byrd ice cores", "projects": [{"proj_uid": "p0000450", "repository": "USAP-DC", "title": "Nitrogen and oxygen gas isotopes in the Siple Dome and Byrd ice cores"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Siple Dome Ice Core", "south": -80.016667, "title": "Nitrogen and Oxygen Gas Isotopes in the Siple Dome and Byrd Ice Cores, Antarctica", "uid": "609407", "west": -119.533333}, {"awards": "0126057 Brook, Edward", "bounds_geometry": null, "date_created": "Tue, 16 Dec 2008 00:00:00 GMT", "description": "Ice Core Interplanetary Dust Helium Isotope Data Helium isotope data from Ice Cores at GISP2 (Greenland) and Vostok (Antarctica) as a proxy for extraterrestrial dust flux.\n", "east": null, "geometry": null, "keywords": "Antarctica; Arctic; Atmosphere; Chemistry:Fluid; Geochemistry; GISP2; Glaciers/Ice Sheet; Ice Core Records; Isotope; Lake Vostok; Paleoclimate; Vostok Ice Core", "locations": "Lake Vostok; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Brook, Edward J.; Kurz, Mark D.", "project_titles": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change", "projects": [{"proj_uid": "p0000034", "repository": "USAP-DC", "title": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "GISP2 (D Core) Helium Isotopes from Interplanetary Dust", "uid": "609361", "west": null}, {"awards": "0126057 Brook, Edward", "bounds_geometry": null, "date_created": "Tue, 16 Dec 2008 00:00:00 GMT", "description": "This ice core data is archived at the World Data Center for Paleoclimatology and is available through the Ice Core Data Gateway. The data includes methane data from the Greenland Ice Sheet Project 2 (GISP2). GISP2 is an ice core project that drilled through the Greenland ice sheet and 1.55 meters into bedrock. The ice core is 3053.44 meters in depth, the deepest ice core recovered in the world at the time. The ice core was completed in 1993 after five years of drilling.\n\nMethane concentrations were determined by GC-FID using standards calibrated by NOAA CMDL. \t\t\t\t\t\nThe gas age time scales and analytical techniques are described in further detail in the publication.", "east": null, "geometry": null, "keywords": "Antarctica; Arctic; Atmosphere; Chemistry:Fluid; Geochemistry; GISP2; Glaciers/Ice Sheet; Ice Core Records; Methane; Paleoclimate; Taylor Dome", "locations": "Taylor Dome; Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Brook, Edward J.", "project_titles": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change", "projects": [{"proj_uid": "p0000034", "repository": "USAP-DC", "title": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "GISP2 (D Core) Methane Concentration Data", "uid": "609360", "west": null}, {"awards": "0337891 Brook, Edward", "bounds_geometry": ["POINT(158 -77.666667)"], "date_created": "Mon, 05 Nov 2007 00:00:00 GMT", "description": "Using new and existing ice core CO2 data from 65 - 30 ka BP a new chronology for Taylor Dome ice core CO2 is established and synchronized with Greenland ice core records to study how high latitude climate change and the carbon cycle were linked during the last glacial period. The new data and chronology should provide a better target for models attempting to explain CO2 variability and abrupt climate change.", "east": 158.0, "geometry": ["POINT(158 -77.666667)"], "keywords": "Antarctica; Atmosphere; Chemistry:Ice; Geochemistry; Glaciers/Ice Sheet; Ice Core Records; Paleoclimate; Taylor Dome; Taylor Dome Ice Core", "locations": "Taylor Dome; Antarctica", "north": -77.666667, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Brook, Edward J.; Ahn, Jinho", "project_titles": "Developing Dry Extraction of Ice Core Gases and Application to Millennial-Scale Variability in Atmospheric CO2", "projects": [{"proj_uid": "p0000268", "repository": "USAP-DC", "title": "Developing Dry Extraction of Ice Core Gases and Application to Millennial-Scale Variability in Atmospheric CO2"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Taylor Dome Ice Core", "south": -77.666667, "title": "Atmospheric CO2 and Climate: Taylor Dome Ice Core, Antarctica", "uid": "609315", "west": 158.0}, {"awards": "0230260 Bender, Michael", "bounds_geometry": ["POINT(106.8 -72.4667)"], "date_created": "Tue, 10 Jul 2007 00:00:00 GMT", "description": "This data set includes a time scale for the Vostok ice core, retrieved from Vostok Station on the East Antarctic Plateau. This chronology is derived by orbitally tuning to molecular oxygen to nitrogen (O\u003csub\u003e2\u003c/sub\u003e/N\u003csub\u003e2\u003c/sub\u003e) ratios in occluded air for depths deeper than 1550 m (greater than 112,000 years old), and by gas correlation to the Greenland Ice Sheet Project 2 (GISP2) chronology for the ice core section that is shallower than 1422 m (less than 102,000 years old). Because of poor gas preservation in air bubbles in shallower depths, investigators could only constrain the Vostok chronology for the section deeper than 1550 m by O\u003csub\u003e2\u003c/sub\u003e/N\u003csub\u003e2\u003c/sub\u003e. Thus for the shallower section of the core, they synchronized the Vostok delta oxygen-18 (\u0026delta;\u003csup\u003e18\u003c/sup\u003eO) and methane (CH\u003csub\u003e4\u003c/sub\u003e) measurements to those of the GISP2 to obtain the chronology (see Bender, et al. 2006). Note, CH\u003csub\u003e4\u003c/sub\u003e data are not included in this data set.\n\nInvestigators analyzed the O\u003csub\u003e2\u003c/sub\u003e/N\u003csub\u003e2\u003c/sub\u003e and the\u003cem\u003e\u003cstrong\u003e \u003c/strong\u003e\u003c/em\u003e\u0026delta;\u003csup\u003e18\u003c/sup\u003eO record ratios for approximately the past 115,000 to 400,000 years in the Vostok ice core. They combined new measurements for O\u003csub\u003e2\u003c/sub\u003e/N\u003csub\u003e2\u003c/sub\u003e and \u0026delta;\u003csup\u003e18\u003c/sup\u003eO with data from Bender (2002) and Petit, et al. (1999), respectively.\n\nData are in Microsoft Excel format and are available via FTP.", "east": 106.8, "geometry": ["POINT(106.8 -72.4667)"], "keywords": "Antarctica; Atmosphere; Chemistry:Fluid; Geochronology; Glaciers/Ice Sheet; Ice Core Records; Lake Vostok; Paleoclimate; Vostok; Vostok Ice Core", "locations": "Lake Vostok; Vostok; Antarctica", "north": -72.4667, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Bender, Michael; Suwa, Makoto", "project_titles": "Collaborative Research: Trapped Gas Composition and the Chronology of the Vostok Ice Core", "projects": [{"proj_uid": "p0000257", "repository": "USAP-DC", "title": "Collaborative Research: Trapped Gas Composition and the Chronology of the Vostok Ice Core"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -72.4667, "title": "Trapped Gas Composition and Chronology of the Vostok Ice Core", "uid": "609311", "west": 106.8}, {"awards": "0126057 Brook, Edward", "bounds_geometry": null, "date_created": "Fri, 27 Aug 2004 00:00:00 GMT", "description": "This data set compares global atmospheric concentration of methane from ice cores taken on the ice sheets of Antarctica and Greenland. The data come from multiple ice cores on each continent, including Greenland Ice Core Project (GRIP) and Greenland Ice Sheet Project (GISP) ice cores and the Byrd and Vostok cores from Antarctica. (The orignal dataset is located at ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/synchronization/)", "east": null, "geometry": null, "keywords": "Antarctica; Chemistry:Ice; Geochemistry; Glaciers/Ice Sheet; Ice Core Records; Paleoclimate; Vostok Ice Core", "locations": "Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Blunier, Thomas; Stauffer, Bernhard; Chappellaz, Jerome; Brook, Edward J.", "project_titles": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change", "projects": [{"proj_uid": "p0000034", "repository": "USAP-DC", "title": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Antarctic and Greenland Climate Change Comparison", "uid": "609253", "west": null}, {"awards": "0512971 Brook, Edward", "bounds_geometry": ["POINT(-149 -81)"], "date_created": "Mon, 18 Aug 2003 00:00:00 GMT", "description": "This data set is part of the WAISCORES project, an NSF-funded project to understand the influence of the West Antarctic ice sheet on climate and sea level change. WAISCORES researchers acquired and analyzed ice cores from the Siple Dome, in the Siple Coast region, West Antarctica.\n\nBrooks measured methane in approximately 196 samples between 55.6 and 738.5 m (0-20 ka) in the Siple Dome ice core, and then extended the Siple Dome methane record at medium resolution down to about 860m, corresponding to an age of about 45 ka. The team compared the results with data from the Greenland Ice Sheet Project 2 (GISP2) and the Greenland Ice Core Project (GRIP).", "east": -149.0, "geometry": ["POINT(-149 -81)"], "keywords": "Antarctica; Chemistry:Fluid; Chemistry:Ice; Geochemistry; Glaciers/Ice Sheet; Glaciology; Ice Core Records; Methane; Paleoclimate; Siple Dome; Siple Dome Ice Core; WAISCORES", "locations": "Siple Dome; Antarctica", "north": -81.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Brook, Edward J.", "project_titles": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change", "projects": [{"proj_uid": "p0000034", "repository": "USAP-DC", "title": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": "Siple Dome Ice Core", "south": -81.0, "title": "Siple Dome Methane Record", "uid": "609124", "west": -149.0}, {"awards": "9419128 Stearns, Charles; 9527603 Stearns, Charles", "bounds_geometry": null, "date_created": "Mon, 18 Aug 2003 00:00:00 GMT", "description": "The Automatic Weather Station (AWS) Project, funded by the NSF Office of Polar Programs, involves collecting meteorological data from an array of automatic weather stations in Antarctica, Greenland, and Peru. Data collection in Antarctica began in 1980.\n\nData are available in tabular ASCII format via the University of Wisconsin\u0027s AWS Project Web site at http://uwamrc.ssec.wisc.edu/aws/. Both raw and \u0027corrected\u0027 versions of the data are available via ftp. Information about data processing and station characteristics is also provided.", "east": null, "geometry": null, "keywords": "Antarctica; Atmosphere; AWS; WeatherStation", "locations": "Antarctica", "north": null, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Stearns, Charles R.; Keller, Linda M.; Weidner, George A.; Lazzara, Matthew", "project_titles": "Continuation for the Antarctic Automatic Weather Station Climate Program 1995-1998", "projects": [{"proj_uid": "p0000151", "repository": "USAP-DC", "title": "Continuation for the Antarctic Automatic Weather Station Climate Program 1995-1998"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": null, "title": "Three-Hourly Antarctic Automatic Weather Station Data, 1980-2000", "uid": "609111", "west": null}, {"awards": "0512971 Brook, Edward", "bounds_geometry": ["POINT(-149 -81)"], "date_created": "Wed, 14 May 2003 00:00:00 GMT", "description": "The data include methane data from the Greenland Ice Sheet Project 2 (GISP2) B \u0026 D Cores. Gas ages were calculated according to the methods described in Brook et\nal. 1996, and are subject to change. Ice ages were calculated by by\nlinear interpolation from the Meese et al. timescale.\n", "east": -149.0, "geometry": ["POINT(-149 -81)"], "keywords": "Arctic; Chemistry:Fluid; Chemistry:Ice; Geochemistry; GISP2; Glaciers/Ice Sheet; Glaciology; Greenland; Ice Core Records; Methane; Paleoclimate", "locations": "Greenland", "north": -81.0, "nsf_funding_programs": "Antarctic Glaciology", "persons": "Brook, Edward J.", "project_titles": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change", "projects": [{"proj_uid": "p0000034", "repository": "USAP-DC", "title": "High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change"}], "repo": "USAP-DC", "repositories": "USAP-DC", "science_programs": null, "south": -81.0, "title": "GISP2 (B and D Core) Methane Concentrations", "uid": "609125", "west": -149.0}]
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Dataset Title/Abstract/Map | NSF Award(s) | Date Created | PIs / Scientists | Project Links | Abstract | Bounds Geometry | Geometry | Selected | Visible |
---|---|---|---|---|---|---|---|---|---|
Atmospheric methane across the Last Glacial Maximum and deglaciation from the GISP2, NEEM and WAIS Divide ice cores
|
1745078 |
2023-10-05 | Riddell-Young, Benjamin; Brook, Edward; Martin, Kaden; Rosen, Julia; Lee, James; Edwards, Jon S. |
Tracing Past Methane Variations with Stable Isotopes in Antarctic Ice Cores |
This dataset includes measurements of atmospheric methane from samples from the NEEM, GISP2 and WAIS Divide ice cores. All measurements were made at the Oregon State University Ice Core and Quaternary Geochemistry Laboratory (Corvallis, OR) using an established analytical system. 433 samples from the NEEM ice core were measured between 1420 and 1560m depths. A measurement uncertainty ranging from 2.8 to 4.2 ppb, depending on the measurement year, was determined from replicate samples. 340 samples from the GISP2 ice core were measured between 1740 and 2060m depths. A measurement uncertainty ranging from 3.1 to 3.4 ppb, depending on the measurement year, was determined from replicate samples. All GISP2 and NEEM data were corrected for excess methane contamination using the established relationship between excess methane and Ca2+ (Lee et al., 2020). Both corrected and uncorrected data are included in the publication. 340 samples from the GISP2 ice core were measured between 1957 and 3081m depths. A measurement uncertainty ranging from 3.1 to 3.4 ppb, depending on the measurement year, was determined from replicate samples. Depths reflect the mid-points of the depth range of each samples, which is typically ~8cm. All replicate measurements are included in the dataset. Lee, J. E. et al. Excess methane in Greenland ice cores associated with high dust concentrations. Geochimica et cosmochimica acta 270, 409-430 (2020). | ["POINT(-112.05 -79.28)"] | ["POINT(-112.05 -79.28)"] | false | false |
Atmospheric methane interpolar difference and four-box troposphere model output across the Last Glacial Maximum and Deglaciation
|
1745078 |
2023-10-02 | Riddell-Young, Benjamin; Brook, Edward; Rosen, Julia; Buizert, Christo; Martin, Kaden; Lee, James; Edwards, Jon S.; Mühl, Michaela; Schmitt, Jochen; Fischer, Hubertus; Blunier, Thomas |
Tracing Past Methane Variations with Stable Isotopes in Antarctic Ice Cores |
This dataset includes estimates of the atmospheric methane relative interpolar difference (rIPD) across the Last Glacial Maximum and Deglaciation. The rIPD was calculated using discrete, high-resolution methane measurements from the WAIS Divide, NEEM and GISP2 ice cores. Two independent IPD records were determined: One using NEEM and WAIS and one using GISP2 and WAIS. The dataset includes rIPD values calculated using both Greenland methane data both corrected and uncorrected for excess methane (Lee et al., 2020). The rIPD was calculated by smoothing each methane record and synchronizing them to the WD2014 gas age scale. 1-sigma rIPD uncertainties are included. This dataset also includes the output of the four-box troposphere model used to interpret the rIPD. For both excess methane-corrected records, the model output and 1-sigma uncertainty is provided for northern extratropical (30N - 90N) and total tropical (30S - 30N) sources in Tg yr-1. For the NEEM-derived rIPD, sections of the rIPD where atmospheric methane changed rapidly were deemed untrustworthy were removed from the dataset. Lee, J. E. et al. Excess methane in Greenland ice cores associated with high dust concentrations. Geochimica et cosmochimica acta 270, 409-430 (2020). | ["POINT(-112.05 -79.28)"] | ["POINT(-112.05 -79.28)"] | false | false |
Concentration and isotopic composition of atmospheric N2O over the last century
|
1643716 |
2023-05-22 | Ghosh, Sambit; Toyoda, Sakae ; Buizert, Christo ; Langenfelds, Ray L ; Yoshida, Naohiro ; Joong Kim, Seong; Ahn, Jinho ; Etheridge, David |
Collaborative Research: Reconstructing Carbon-14 of Atmospheric Carbon Monoxide from Law Dome, Antarctica to Constrain Long-Term Hydroxyl Radical Variability |
We have reconstructed the atmospheric N2O mole fraction and its isotopic composition by combining data from ice cores, firn air, and atmospheric samples. The mole fraction reconstruction extends back to 1000 CE using ice cores, firn air, and atmospheric sampling; and the isotopic reconstruction extends back to 1900 CE using only firn air data. We have incorporated both newly measured and previously published data. We present new data for the mole fraction, d15Nbulk, d18O, and d15NSP values from the Styx (East Antarctica) firn air, and mole fraction from the North Greenland Eemian Ice drilling Project (NEEM) firn air. We have used published records from the Styx and NEEM ice cores, direct atmospheric measurements from the NOAA global sampling network, and firn air data, giving a total of 11 sites for N2O mole fraction, 12 sites for d15Nbulk, 11 sites for d18O, and 8 sites for d15NSP values. | ["POLYGON((-180 -67,-144 -67,-108 -67,-72 -67,-36 -67,0 -67,36 -67,72 -67,108 -67,144 -67,180 -67,180 -69.3,180 -71.6,180 -73.9,180 -76.2,180 -78.5,180 -80.8,180 -83.1,180 -85.4,180 -87.7,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87.7,-180 -85.4,-180 -83.1,-180 -80.8,-180 -78.5,-180 -76.2,-180 -73.9,-180 -71.6,-180 -69.3,-180 -67))"] | ["POINT(0 -89.999)"] | false | false |
WAIS Divide Core 10Be data, 2850-3240 m
|
1644128 1644094 |
2023-05-20 | Welten, Kees; Caffee, Marc; Woodruff, Thomas |
Synchronizing the WAIS Divide and Greenland Ice Cores from 30-65 ka BP using high-resolution 10Be measurements |
This dataset contains a continuous depth profile of 10Be measured in ice core samples from the WAIS Divide Core between 2850 and 3240 m depth. | ["POINT(-112.05 -79.28)"] | ["POINT(-112.05 -79.28)"] | false | false |
Summer 2021 Summit Station radar echo data
|
2118315 2112352 2019597 |
2023-03-20 | Besson, Dave | No project link provided | Data collected by RNO-G collaboration, used to calculate attenuation lengths, internal layer reflectivities and bulk refractive index. LPDA transmitter on surface broadcasts ~10-ns high voltage pulse into ice and echoes recorded on similar surface LPDA. Data recorded on digital scope, after averaging 10000 triggers to elucidate weak features. Funding for this dataset was provided by NSF Grants and Deutsche Forschungsgemeinschaft (DFG, Grant NE 2031/2-1). | ["POLYGON((-180 72.5797,-158.15409 72.5797,-136.30818 72.5797,-114.46227 72.5797,-92.61636 72.5797,-70.77045 72.5797,-48.92454000000001 72.5797,-27.078630000000004 72.5797,-5.23272 72.5797,16.613190000000003 72.5797,38.4591 72.5797,38.4591 72.57968,38.4591 72.57966,38.4591 72.57964,38.4591 72.57962,38.4591 72.5796,38.4591 72.57957999999999,38.4591 72.57956,38.4591 72.57954,38.4591 72.57952,38.4591 72.5795,16.61319 72.5795,-5.23272 72.5795,-27.078629999999997 72.5795,-48.92454 72.5795,-70.77045000000001 72.5795,-92.61635999999999 72.5795,-114.46226999999999 72.5795,-136.30818 72.5795,-158.15409 72.5795,180 72.5795,165.84593 72.5795,151.69186 72.5795,137.53779 72.5795,123.38372 72.5795,109.22964999999999 72.5795,95.07558 72.5795,80.92151 72.5795,66.76744 72.5795,52.61336999999999 72.5795,38.4593 72.5795,38.4593 72.57952,38.4593 72.57954,38.4593 72.57956,38.4593 72.57957999999999,38.4593 72.5796,38.4593 72.57962,38.4593 72.57964,38.4593 72.57966,38.4593 72.57968,38.4593 72.5797,52.61337 72.5797,66.76744 72.5797,80.92151 72.5797,95.07558 72.5797,109.22965 72.5797,123.38372 72.5797,137.53779 72.5797,151.69186000000002 72.5797,165.84593 72.5797,-180 72.5797))"] | ["POINT(-141.5408 72.5796)"] | false | false |
Replicate O-17-excess by continuous flow laser spectroscopy for an ice core section at Summit, Greenland
|
2019719 1841844 |
2023-01-25 | Davidge, Lindsey |
Center for Oldest Ice Exploration |
This data set contains replicate measurements of D17O from a 92-m deep section of core at Summit, Greenland and other operational data necessary to reconstruct figures presented in Davidge et al., 2022. Details of the entire dataset and a description of the relevant methods can be found in Davidge et al., 2022. The names of each sheet indicate the corresponding figure numbers. The D17O record spans about two years of accumulation. Discrete measurements by laser spectroscopy are provided at 1.4-cm resolution. For the purpose of method development, continuous-flow measurements are provided with nine replicates and are averaged to multiple depth resolutions as described in Davidge et al., 2022. | [] | [] | false | false |
2019 initial L-band radar data for EGRIP
|
1921418 |
2021-12-08 | Taylor, Drew; Gogineni, Prasad; O'Neill, Charles; Taylor, Ryan |
EAGER: L-Band Radar Ice Sounder for Measuring Ice Basal Conditions and Ice-Shelf Melt Rate |
This dataset includes a preliminary 1-km line of L-band radar data near the East Greenland Ice core Project. The data have been pulse compressed and focused using a simple Doppler focusing algorithm. | ["POLYGON((35 76,35.1 76,35.2 76,35.3 76,35.4 76,35.5 76,35.6 76,35.7 76,35.8 76,35.9 76,36 76,36 75.9,36 75.8,36 75.7,36 75.6,36 75.5,36 75.4,36 75.3,36 75.2,36 75.1,36 75,35.9 75,35.8 75,35.7 75,35.6 75,35.5 75,35.4 75,35.3 75,35.2 75,35.1 75,35 75,35 75.1,35 75.2,35 75.3,35 75.4,35 75.5,35 75.6,35 75.7,35 75.8,35 75.9,35 76))"] | ["POINT(35.5 75.5)"] | false | false |
Circum-Antarctic grounding-line sinuosity
|
1246353 1745043 1745055 |
2021-11-10 | Simkins, Lauren; Stearns, Leigh; Riverman, Kiya |
Evidence for Paleo Ice Stream Collapse in the Western Ross Sea since the Last Glacial Maximum. Collaborative Research: Topographic controls on Antarctic Ice Sheet grounding line retreat - integrating models and observations |
The dataset here allows exploration of the causes and significance of Antarctic grounding-line sinuosity by coupling observations of contemporary Antarctic grounding lines and paleo-grounding lines expressed as ice-marginal landforms on the Ross Sea continental shelf. Modern grounding lines are derived from the MEaSUREs Version 2 Differential Satellite Radar Interferometry dataset with spatial resolutions of 25-120 m spanning February 1992 to December 2014 (Rignot et al., 2016; Mouginot et al., 2017). The boundaries of individual grounding lines representative of individual glacial catchments (n=664) were delineated by the inflection points of the shear strain rate, εxy (c.f Van der Veen et al., 2011). Sinuosity was calculated as the ratio of the true length, orthogonal to ice-flow direction, of the grounding lines and the straight line length between end-points and in units of km/km. Raster data were extracted at 1-km points along each grounding line; the mean was calculated for each grounding line and merged in a table with sinuosity data. A dataset of 6,275 paleo-grounding lines expressed as ice-marginal landforms on the deglaciated western Ross Sea continental shelf are used in this study, originally published by Simkins et al., 2018. The ice-marginal landforms were mapped from multibeam echo sounder data that was collected onboard the RVIB Nathaniel B. Palmer (NBP) 15-02 cruise using a Kongsberg EM122 operating in dual swath mode at 12 kHz frequency with 30-60% swath overlap (Cruise DOI: 10.7284/901477). The resulting bathymetry data was gridded at 20-40 m with decimeter vertical elevation resolution depending on water depth and sea-state. Sinuosity is calculated as a ratio of true (mapped) landform length, measured in the across paleo-ice flow direction at the crest of the landform, to the straight line distance between the mapped landform endpoints and in units of km/km. To compare modern and paleo-grounding lines, we use a consistent length scale by segmenting the grounding lines into 2-km sections for the two datasets (modern, n=12,966; paleo, n=5,832), even though this eliminates grounding lines that are less than 2-km long and thus results in 1 modern and 3,873 paleo-grounding lines removed. The full-length and 2-km segmented groundings lines are provided as shapefiles "InSAR_groundinglines_full" and "InSAR_groundinglines_2km", the paleo-grounding lines are provided as shapefiles "RossSea_icemarginal_full" and "RossSea_icemarginal_2km", and points marking modern grounding lines retreat from repeat InSAR surveys are provided as shapefile "InSAR_retreat_points", all stored together in a geodatabase named "Antarctic_groundinglines.gbd". Additional grounding line metrics, including length, sinuosity, bed roughness, and bed slope for modern and paleo-grounding lines, and height-above-buoyancy gradient, ice-flow velocity, presence of pinning points and ice shelves are provided for modern grounding lines. The published dataset was compiled and analyzed in the article "Controls on circum-Antarctic grounding-line sinuosity " by Simkins, L.M., Stearns, L.A., and Riverman, K.L, which will be submitted to a peer-review journal in November 2021. References Mouginot, J., B. Scheuchl, and E. Rignot. 2017. MEaSUREs Antarctic Boundaries for IPY 2007-2009 from Satellite Radar, Version 2. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. Rignot, E., J. Mouginot, and B. Scheuchl. 2016. MEaSUREs Antarctic Grounding Line from Differential Satellite Radar Interferometry, Version 2. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. Simkins, L. M., Greenwood, S. L., & Anderson, J. B. (2018). Diagnosing ice sheet grounding line stability from landform morphology. The Cryosphere, 12(8), 2707-2726. Van der Veen, C. J., J. C. Plummer, & L. A. Stearns. (2011). Controls on the recent speed up of Jakobshavn Isbræ, West Greenland. Journal of Glaciology, 57(204), 770-782 | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] | ["POINT(0 -89.999)"] | false | false |
Bistatic Radar Sounding of Whillans Ice Stream, Antarctica and Store Glacier, Greenland
|
1543441 1656518 |
2021-09-14 | Bienert, Nicole; Schroeder, Dustin; Siegfried, Matthew; Peters, Sean; MacKie, Emma; Dawson, Eliza; Christoffersen, Poul |
Collaborative Research: Subglacial Antarctic Lakes Scientific Access (SALSA): Integrated Study of Carbon Cycling in Hydrologically-active Subglacial Environments |
This dataset includes raw, uncalibrated voltage vs time measurements from a bistatic radar receiver. We also include some processed data including upsampled matched filtered data, GPS receiver position, antenna separation | [] | [] | false | false |
Simulations of 10Be over Antarctica
|
1443448 1443144 |
2021-02-03 | Ding, Qinghua; Schaefer, Joerg; Steig, Eric J. |
Collaborative Research: A High-sensitivity Beryllium-10 Record from an Ice Core at South Pole |
Experiments were conducted using ECHAM5-HAM atmospheric aerosol - climate model at horizontal resolution of T42 (~2.8° latitude × 2.8° longitude) with 19 vertical levels to examine the relationship between the production of 10Be in the atmosphere and its deposition at the surface. Five experiments were conducted, using a) constant 10Be production but varying, observed climate b) climatological climate of the last 50 years but varying 10Be production, c) constant 10Be production with 50-years of varying climate for 0 ka, (d) 6 ka, and (e) 21 ka, using the TraCE21 simulation to provide boundary conditions. The results will be useful for comparison with 10Be concentration records obtained from the South Pole ice core and other Antarctic and Greenland records. | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] | ["POINT(0 -89.999)"] | false | false |
Multi-site ice core Krypton stable isotope ratios
|
1543229 1543267 |
2020-10-22 | Buizert, Christo; Shackleton, Sarah; Severinghaus, Jeffrey P.; Brook, Edward J.; Baggenstos, Daniel; Bereiter, Bernhard; Etheridge, David; Bertler, Nancy; Pyne, Rebecca L.; Mulvaney, Robert; Mosley-Thompson, Ellen |
Collaborative research: Kr-86 as a proxy for barometric pressure variability and movement of the SH westerlies during the last
deglaciation |
Stable isotope ratios of atmospheric krypton, argon, nitrogen and oxygen were measured in late-Holocene ice core samples from nine sites in Antarctica and Greenland, for the purpose of calibrating the Kr-86 excess proxy as defined in Buizert and Severinghaus (2016). | ["POLYGON((-180 -60,-144 -60,-108 -60,-72 -60,-36 -60,0 -60,36 -60,72 -60,108 -60,144 -60,180 -60,180 -63,180 -66,180 -69,180 -72,180 -75,180 -78,180 -81,180 -84,180 -87,180 -90,144 -90,108 -90,72 -90,36 -90,0 -90,-36 -90,-72 -90,-108 -90,-144 -90,-180 -90,-180 -87,-180 -84,-180 -81,-180 -78,-180 -75,-180 -72,-180 -69,-180 -66,-180 -63,-180 -60))"] | ["POINT(0 -89.999)"] | false | false |
Density, hydrology and geophysical measurements from the Wilkins Ice Shelf firn aquifer
|
1745116 |
2020-10-21 | Miège, Clément; Montgomery, Lynn; Miller, Julie; Scambos, Ted; Wallin, Bruce; Miller, Olivia; Solomon, Kip; Forster, Richard; Koenig, Lora |
Antarctic Firn Aquifers: Extent, Characteristics, and Comparison with Greenland Occurrences |
This dataset compiles a suite of glaciology (density, stratigraphy), hydrology (slug and dilution tests) and geophysical measurements (GPS, GPR, ApRES) to characterize a firn aquifer observed within the Wilkins Ice Shelf, Antarctica. | ["POLYGON((-72 -70.75,-71.95 -70.75,-71.9 -70.75,-71.85 -70.75,-71.8 -70.75,-71.75 -70.75,-71.7 -70.75,-71.65 -70.75,-71.6 -70.75,-71.55 -70.75,-71.5 -70.75,-71.5 -70.775,-71.5 -70.8,-71.5 -70.825,-71.5 -70.85,-71.5 -70.875,-71.5 -70.9,-71.5 -70.925,-71.5 -70.95,-71.5 -70.975,-71.5 -71,-71.55 -71,-71.6 -71,-71.65 -71,-71.7 -71,-71.75 -71,-71.8 -71,-71.85 -71,-71.9 -71,-71.95 -71,-72 -71,-72 -70.975,-72 -70.95,-72 -70.925,-72 -70.9,-72 -70.875,-72 -70.85,-72 -70.825,-72 -70.8,-72 -70.775,-72 -70.75))"] | ["POINT(-71.75 -70.875)"] | false | false |
Early Holocene methane records from Siple Dome, Antarctica
|
1043518 |
2017-09-11 | Yang, Ji-Woong; Ahn, Jinho |
Collaborative Research: Completing an ultra-high resolution methane record from the WAIS Divide ice core |
Below we present the early Holocene discrete CH4 dataset from Siple Dome (SDMA), Antarctica, measured at Oregon State University (OSU) and Seoul National University (SNU) by discrete wet extraction technique. Analytical method is described in Grachev et al. (2009) and Mitchell et al. (2011) for OSU data, and Yang et al. (2017) for SNU data. SDMA CH4 composite record was constructed by combining OSU data for 7.6 - 9.0 ka and SNU data for 9.0 - 11.6 ka to maximize temporal resolution. SDMA gas chronology was synchronized to Greenland Ice Core Chronology 2005 (GICC05) scale. For detailed description on synchronization and age uncertainty please refer to Yang et al. (2017). | ["POLYGON((-113 -79,-112.8 -79,-112.6 -79,-112.4 -79,-112.2 -79,-112 -79,-111.8 -79,-111.6 -79,-111.4 -79,-111.2 -79,-111 -79,-111 -79.1,-111 -79.2,-111 -79.3,-111 -79.4,-111 -79.5,-111 -79.6,-111 -79.7,-111 -79.8,-111 -79.9,-111 -80,-111.2 -80,-111.4 -80,-111.6 -80,-111.8 -80,-112 -80,-112.2 -80,-112.4 -80,-112.6 -80,-112.8 -80,-113 -80,-113 -79.9,-113 -79.8,-113 -79.7,-113 -79.6,-113 -79.5,-113 -79.4,-113 -79.3,-113 -79.2,-113 -79.1,-113 -79))"] | ["POINT(-112 -79.5)"] | false | false |
WD2014: Timescale for WAIS Divide Core 2006 A (WDC-06A)
|
0944197 |
2017-03-28 | Fudge, T. J. |
Collaborative Research: Establishing the Chronology and Histories of Accumulation and Ice Dynamics for the WAIS Divide Core |
The West Antarctic Ice Sheet Divide (WAIS Divide, WD) ice core is a newly drilled, high-accumulation deep ice core that provides Antarctic climate records of the past ~68 ka at unprecedented temporal resolution. The upper 2850 m (back to 31.2 ka BP) have been dated using annual-layer counting. Here we present a chronology for the deep part of the core (67.8-31.2 ka BP), which is based on stratigraphic matching to annual-layer-counted Greenland ice cores using globally well-mixed atmospheric methane. We calculate the WD gas age-ice age difference (Delta age) using a combination of firn densification modeling, ice-flow modeling, and a data set of d15N-N2, a proxy for past firn column thickness. The largest Delta age at WD occurs during the Last Glacial Maximum, and is 525 +/- 120 years. Internally consistent solutions can be found only when assuming little to no influence of impurity content on densification rates, contrary to a recently proposed hypothesis. We synchronize the WD chronology to a linearly scaled version of the layer-counted Greenland Ice Core Chronology (GICC05), which brings the age of Dansgaard-Oeschger (DO) events into agreement with the U/Th absolutely dated Hulu Cave speleothem record. The small Delta age at WD provides valuable opportunities to investigate the timing of atmospheric greenhouse gas variations relative to Antarctic climate, as well as the interhemispheric phasing of the \"bipolar seesaw\". We present the WD2014 chronology for the upper part (0-2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes in the source, transport, and deposition of aerosols. The measurements were interpreted manually and with the aid of two automated methods. We validated the chronology by comparing to two high-accuracy, absolutely dated chronologies. For the Holocene, the cosmogenic isotope records of 10Be from WAIS Divide and 14C for IntCal13 demonstrated that WD2014 was consistently accurate to better than 0.5% of the age. For the glacial period, comparisons to the Hulu Cave chronology demonstrated that WD2014 had an accuracy of better than 1% of the age at three abrupt climate change events between 27 and 31ka. WD2014 has consistently younger ages than Greenland ice core chronologies during most of the Holocene. For the Younger Dryas-Preboreal transition (11.595 ka; 24 years younger) and the Bolling-Allerod Warming (14.621 ka; 7 years younger), WD2014 ages are within the combined uncertainties of the timescales. Given its high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere, with synchronization to other chronologies feasible using high-quality proxies of volcanism, solar activity, atmospheric mineral dust, and atmospheric methane concentrations. | ["POINT(-112.1115 -79.481)"] | ["POINT(-112.1115 -79.481)"] | false | false |
Measurements of in situ cosmogenic 14C from Taylor Glacier, Antarctica
|
0839031 |
2016-01-01 | Severinghaus, Jeffrey P. |
Collaborative Research: A "Horizontal Ice Core" for Large-Volume Samples of the Past Atmosphere, Taylor Glacier, Antarctica |
This award supports a project to develop a precise gas-based chronology for an archive of large-volume samples of the ancient atmosphere, which would enable ultra-trace gas measurements that are currently precluded by sample size limitations of ice cores. The intellectual merit of the proposed work is that it will provide a critical test of the 'clathrate hypothesis' that methane clathrates contributed to the two abrupt atmospheric methane concentration increases during the last deglaciation 15 and 11 kyr ago. This approach employs large volumes of ice (>1 ton) to measure carbon-14 on past atmospheric methane across the abrupt events. Carbon-14 is an ideal discriminator of fossil sources of methane to the atmosphere, because most methane sources (e.g., wetlands, termites, biomass burning) are rich in carbon-14, whereas clathrates and other fossil sources are devoid of carbon-14. The proposed work is a logical extension to Taylor Glacier, Antarctica, of an approach pioneered at the margin of the Greenland ice sheet over the past 7 years. The Greenland work found higher-than-expected carbon-14 values, likely due in part to contaminants stemming from the high impurity content of Greenland ice and the interaction of the ice with sediments from the glacier bed. The data also pointed to the possibility of a previously unknown process, in-situ cosmogenic production of carbon-14 methane (radiomethane) in the ice matrix. Antarctic ice in Taylor Glacier is orders of magnitude cleaner than the ice at the Greenland site, and is much colder and less stratigraphically disturbed, offering the potential for a clear resolution of this puzzle and a definitive test of the cosmogenic radiomethane hypothesis. Even if cosmogenic radiomethane in ice is found, it still may be possible to reconstruct atmospheric radiomethane with a correction enabled by a detailed understanding of the process, which will be sought by co-measuring carbon-14 in carbon monoxide and carbon dioxide. The broader impacts of the proposed work are that the clathrate test may shed light on the stability of the clathrate reservoir and its potential for climate feedbacks under human-induced warming. Development of Taylor Glacier as a 'horizontal ice core' would provide a community resource for other researchers. Education of one postdoc, one graduate student, and one undergraduate, would add to human resources. This award has field work in Antarctica. | ["POINT(161.71965 -77.76165)"] | ["POINT(161.71965 -77.76165)"] | false | false |
Inverted Basal Shear Stress of Antarctic and Greenland Ice Streams and Glaciers
|
0934534 |
2015-07-07 | Sergienko, Olga |
COLLABORATIVE RESEARCH: Enabling ice sheet sensitivity and stability analysis with a large-scale higher-order ice sheet model's adjoint to support sea level change assessment |
This data set includes basal shear distributions inferred from surface observations - surface ice velocities (Joughin et al., 2010, Rignot et al., 2011), bed and surface elevations (Fretwell et al., 2013) under ten selected locations in Greenland and Antarctica. In Greenland, the locations were: 79° North and Zachariae Glaciers, Jakobshan Isbrae, North East Greenland Ice Stream, Petermann Glacier. The Antarctica locations were Bindschadler Ice Stream, Lambert Ice Stream, MacAyeal Ice Stream, Pine Island Glacier, Thwaites Glacier, and an unnamed location around ~40° E 84° S. | ["POLYGON((-75 84,-69.5 84,-64 84,-58.5 84,-53 84,-47.5 84,-42 84,-36.5 84,-31 84,-25.5 84,-20 84,-20 81.6,-20 79.2,-20 76.8,-20 74.4,-20 72,-20 69.6,-20 67.2,-20 64.8,-20 62.4,-20 60,-25.5 60,-31 60,-36.5 60,-42 60,-47.5 60,-53 60,-58.5 60,-64 60,-69.5 60,-75 60,-75 62.4,-75 64.8,-75 67.2,-75 69.6,-75 72,-75 74.4,-75 76.8,-75 79.2,-75 81.6,-75 84))", "POLYGON((-150 -75,-129 -75,-108 -75,-87 -75,-66 -75,-45 -75,-24 -75,-3 -75,18 -75,39 -75,60 -75,60 -76.5,60 -78,60 -79.5,60 -81,60 -82.5,60 -84,60 -85.5,60 -87,60 -88.5,60 -90,39 -90,18 -90,-3 -90,-24 -90,-45 -90,-66 -90,-87 -90,-108 -90,-129 -90,-150 -90,-150 -88.5,-150 -87,-150 -85.5,-150 -84,-150 -82.5,-150 -81,-150 -79.5,-150 -78,-150 -76.5,-150 -75))"] | ["POINT(-47.5 72)", "POINT(-45 -82.5)"] | false | false |
A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea
|
1043485 |
2015-01-01 | Kurz, Mark D.; Curtice, Josh |
Collaborative Research: A New Reconstruction of the Last West Antarctic Ice Sheet Deglaciation in the Ross Sea |
This award supports a project to develop a better understanding of the response of the WAIS to climate change. The timing of the last deglaciation of the western Ross Sea will be improved using in situ terrestrial cosmogenic nuclides (3He, 10Be, 14C, 26Al, 36Cl) to date glacial erratics at key areas and elevations along the western Ross Sea coast. A state-of-the art ice sheet-shelf model will be used to identify mechanisms of deglaciation of the Ross Sea sector of WAIS. The model results and forcing will be compared with observations including the new cosmogenic data proposed here, with the aim of better determining and understanding the history and causes of WAIS deglaciation in the Ross Sea. There is considerable uncertainty, however, in the history of grounding line retreat from its last glacial maximum position, and virtually nothing is known about the timing of ice- surface lowering prior to ~10,000 years ago. Given these uncertainties, we are currently unable to assess one of the most important questions regarding the last deglaciation of the global ice sheets, namely as to whether the Ross Sea sector of WAIS contributed significantly to meltwater pulse 1A (MWP-1A), an extraordinarily rapid (~500-year duration) episode of ~20 m sea-level rise that occurred ~14,500 years ago. The intellectual merit of this project is that recent observations of startling changes at the margins of the Greenland and Antarctic ice sheets indicate that dynamic responses to warming may play a much greater role in the future mass balance of ice sheets than considered in current numerical projections of sea level rise. The broader impacts of this work are that it has direct societal relevance to developing an improved understanding of the response of the West Antarctic ice sheet to current and possible future environmental changes including the sea-level response to glacier and ice sheet melting due to global warming. The PI will communicate results from this project to a variety of audiences through the publication of peer-reviewed papers and by giving talks to public audiences. Finally the project will support a graduate student and undergraduate students in all phases of field-work, laboratory work and data interpretation. | ["POLYGON((163.4 -77.47989,163.9848 -77.47989,164.5696 -77.47989,165.1544 -77.47989,165.7392 -77.47989,166.324 -77.47989,166.9088 -77.47989,167.4936 -77.47989,168.0784 -77.47989,168.6632 -77.47989,169.248 -77.47989,169.248 -77.565701,169.248 -77.651512,169.248 -77.737323,169.248 -77.823134,169.248 -77.908945,169.248 -77.994756,169.248 -78.080567,169.248 -78.166378,169.248 -78.252189,169.248 -78.338,168.6632 -78.338,168.0784 -78.338,167.4936 -78.338,166.9088 -78.338,166.324 -78.338,165.7392 -78.338,165.1544 -78.338,164.5696 -78.338,163.9848 -78.338,163.4 -78.338,163.4 -78.252189,163.4 -78.166378,163.4 -78.080567,163.4 -77.994756,163.4 -77.908945,163.4 -77.823134,163.4 -77.737323,163.4 -77.651512,163.4 -77.565701,163.4 -77.47989))"] | ["POINT(166.324 -77.908945)"] | false | false |
Standing Water Depth on Larsen B Ice Shelf
|
0944248 |
2014-04-29 | MacAyeal, Douglas |
Model Studies of Surface Water Behavior on Ice Shelves |
This data set addresses why surface melt water lakes on ice shelves and ice sheets are notably influential in triggering ice-shelf break-up and modulating seasonal ice flow, and are thus principle avenues by which environmental change can be transmitted to the ice sheets of Antarctica and Greenland. A comparative analysis is performed of lake geometry and derived depth (using Landsat image reflectance) in two distinct regions, one a collapsing ice shelf and the other an ablation zone of a land terminating ice sheet, to better characterize the range of surface lake variability. | ["POLYGON((-63 -63,-62.2 -63,-61.4 -63,-60.6 -63,-59.8 -63,-59 -63,-58.2 -63,-57.4 -63,-56.6 -63,-55.8 -63,-55 -63,-55 -63.4,-55 -63.8,-55 -64.2,-55 -64.6,-55 -65,-55 -65.4,-55 -65.8,-55 -66.2,-55 -66.6,-55 -67,-55.8 -67,-56.6 -67,-57.4 -67,-58.2 -67,-59 -67,-59.8 -67,-60.6 -67,-61.4 -67,-62.2 -67,-63 -67,-63 -66.6,-63 -66.2,-63 -65.8,-63 -65.4,-63 -65,-63 -64.6,-63 -64.2,-63 -63.8,-63 -63.4,-63 -63))"] | ["POINT(-59 -65)"] | false | false |
Late Holocene Methane Concentrations from WAIS Divide and GISP2
|
0538578 0538538 0944584 |
2014-01-31 | Mitchell, Logan E |
Collaborative Research: Constructing an Ultra-high Resolution Atmospheric Methane Record for the Last 140,000 Years from WAIS Divide Core. |
This data set measures methane concentrations in ancient air trapped in the West Antarctic Ice Sheet (WAIS) Divide and Greenland Ice Sheet Project (GISP2) ice cores; presenting two, high-resolution ice core methane records of the past 2500 years, one from each pole. These measurements were used to reconstruct the methane Inter-Polar Difference (IPD) during the late Holocene. Also included are model results of methane emissions that were presented in the manuscript describing this data set. | ["POINT(-38.5 72.6)", "POINT(-112.0865 -79.4676)"] | ["POINT(-38.5 72.6)", "POINT(-112.0865 -79.4676)"] | false | false |
Alkanes in Firn Air Samples, Antarctica and Greenland
|
0739598 |
2011-11-30 | Aydin, Murat; Saltzman, Eric |
Collaborative Research: Methane Isotopes, Hydrocarbons, and other Trace Gases in South Pole Firn Air |
This data set contains ethane, propane, and n-butane measurements in firn air from the South Pole and the West Antarctic Ice Sheet (WAIS) Divide in Antarctica, and from Summit, Greenland. The WAIS Divide and South Pole samples were collected in December to January of of 2005/06 and 2008/09, respectively. The Summit firn was sampled in the summer of 2006. Analyses were conducted on a gas chromatography - mass spectrometry (GC-MS) system at the University of California, Irvine. Measurements and the associated uncertainties are reported as dry air molar mixing ratios in part per trillion (ppt). The reported measurements for each sampling depth represent a mean of multiple measurements on more than one flask in most cases. Data are available via FTP in Microsoft Excel (.xls) format. | ["POINT(112.09 -79.47)", "POINT(0 -90)", "POINT(-38.3833 72.5833)"] | ["POINT(112.09 -79.47)", "POINT(0 -90)", "POINT(-38.3833 72.5833)"] | false | false |
Microstructural Location and Composition of Impurities in Polar Ice Cores
|
0440523 9980379 |
2010-02-15 | Baker, Ian; Obbard, Rachel |
The Physical Properties of the US ITASE Firn and Ice Cores from South Pole to Taylor Dome |
This data set contains measurements of impurities and ions in three polar ice cores: the Vostok 5G ice core and the Byrd ice core from Antarctica, and the Greenland Ice Sheet Project 2 (GISP2) D core. Parameters include sample depth, grain size, ion concentration, and ice core impurity information. Measurements were made using Ion Chromatography (IC), optical microscopy, and Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM/EDS). Data are available via FTP in Microsoft Excel (.xls)and Microsoft Word (.doc) formats. | ["POINT(-38.466667 72.583333)", "POINT(-119.516667 -80.016667)", "POINT(106.8 -72.466667)"] | ["POINT(-38.466667 72.583333)", "POINT(-119.516667 -80.016667)", "POINT(106.8 -72.466667)"] | false | false |
Methane Measurements from the GISP2 and Siple Dome Ice Cores
|
0520523 |
2009-12-09 | Brook, Edward J. |
Collaborative Research: New insights into the Holocene methane budget from dual isotope systematics and a high resolution record of the interpolar gradient |
This data set contains methane measurements made in trapped air in the Holocene sections of two ice cores: the Siple Dome ice core in Antarctica, and the Greenland Ice Sheet Project 2 (GISP2) ice core in Greenland. The measurements were made at Oregon State University between 2007 and 2009. Measurements were made relative to the NOAA04 methane concentration scale using a working standard internally calibrated to NOAA certified air standards. Concentrations are corrected for gravitational fractionation and solubility effects in the melt-refreeze extraction. Data are available via FTP in Microsoft Excel (.xls) format. | ["POINT(-38.466667 73.583333)", "POINT(-148.81 -81.65)"] | ["POINT(-38.466667 73.583333)", "POINT(-148.81 -81.65)"] | false | false |
Nitrogen and Oxygen Gas Isotopes in the Siple Dome and Byrd Ice Cores, Antarctica
|
0440975 |
2009-07-17 | Severinghaus, Jeffrey P. |
Nitrogen and oxygen gas isotopes in the Siple Dome and Byrd ice cores |
This data set consists of Gas-isotopic data from the Siple Dome and and Greenland Ice Sheet Project 2 (GISP2) ice cores covering roughly the last 100,000 years (100 ka), consisting of d15N (15N/14N) of N2, d18O (18O/16O) of O2, dO2/N2, and dAr/N2. Derived parameters include d18Oatm, d15N, dO2/N2, and dAr/N2. Data are available via FTP as ASCII text files (.txt) and Microsoft Excel files (.xls). | ["POINT(-119.533333 -80.016667)"] | ["POINT(-119.533333 -80.016667)"] | false | false |
GISP2 (D Core) Helium Isotopes from Interplanetary Dust
|
0126057 |
2008-12-16 | Brook, Edward J.; Kurz, Mark D. |
High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change |
Ice Core Interplanetary Dust Helium Isotope Data Helium isotope data from Ice Cores at GISP2 (Greenland) and Vostok (Antarctica) as a proxy for extraterrestrial dust flux. | [] | [] | false | false |
GISP2 (D Core) Methane Concentration Data
|
0126057 |
2008-12-16 | Brook, Edward J. |
High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change |
This ice core data is archived at the World Data Center for Paleoclimatology and is available through the Ice Core Data Gateway. The data includes methane data from the Greenland Ice Sheet Project 2 (GISP2). GISP2 is an ice core project that drilled through the Greenland ice sheet and 1.55 meters into bedrock. The ice core is 3053.44 meters in depth, the deepest ice core recovered in the world at the time. The ice core was completed in 1993 after five years of drilling. Methane concentrations were determined by GC-FID using standards calibrated by NOAA CMDL. The gas age time scales and analytical techniques are described in further detail in the publication. | [] | [] | false | false |
Atmospheric CO2 and Climate: Taylor Dome Ice Core, Antarctica
|
0337891 |
2007-11-05 | Brook, Edward J.; Ahn, Jinho |
Developing Dry Extraction of Ice Core Gases and Application to Millennial-Scale Variability in Atmospheric CO2 |
Using new and existing ice core CO2 data from 65 - 30 ka BP a new chronology for Taylor Dome ice core CO2 is established and synchronized with Greenland ice core records to study how high latitude climate change and the carbon cycle were linked during the last glacial period. The new data and chronology should provide a better target for models attempting to explain CO2 variability and abrupt climate change. | ["POINT(158 -77.666667)"] | ["POINT(158 -77.666667)"] | false | false |
Trapped Gas Composition and Chronology of the Vostok Ice Core
|
0230260 |
2007-07-10 | Bender, Michael; Suwa, Makoto |
Collaborative Research: Trapped Gas Composition and the Chronology of the Vostok Ice Core |
This data set includes a time scale for the Vostok ice core, retrieved from Vostok Station on the East Antarctic Plateau. This chronology is derived by orbitally tuning to molecular oxygen to nitrogen (O<sub>2</sub>/N<sub>2</sub>) ratios in occluded air for depths deeper than 1550 m (greater than 112,000 years old), and by gas correlation to the Greenland Ice Sheet Project 2 (GISP2) chronology for the ice core section that is shallower than 1422 m (less than 102,000 years old). Because of poor gas preservation in air bubbles in shallower depths, investigators could only constrain the Vostok chronology for the section deeper than 1550 m by O<sub>2</sub>/N<sub>2</sub>. Thus for the shallower section of the core, they synchronized the Vostok delta oxygen-18 (δ<sup>18</sup>O) and methane (CH<sub>4</sub>) measurements to those of the GISP2 to obtain the chronology (see Bender, et al. 2006). Note, CH<sub>4</sub> data are not included in this data set. Investigators analyzed the O<sub>2</sub>/N<sub>2</sub> and the<em><strong> </strong></em>δ<sup>18</sup>O record ratios for approximately the past 115,000 to 400,000 years in the Vostok ice core. They combined new measurements for O<sub>2</sub>/N<sub>2</sub> and δ<sup>18</sup>O with data from Bender (2002) and Petit, et al. (1999), respectively. Data are in Microsoft Excel format and are available via FTP. | ["POINT(106.8 -72.4667)"] | ["POINT(106.8 -72.4667)"] | false | false |
Antarctic and Greenland Climate Change Comparison
|
0126057 |
2004-08-27 | Blunier, Thomas; Stauffer, Bernhard; Chappellaz, Jerome; Brook, Edward J. |
High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change |
This data set compares global atmospheric concentration of methane from ice cores taken on the ice sheets of Antarctica and Greenland. The data come from multiple ice cores on each continent, including Greenland Ice Core Project (GRIP) and Greenland Ice Sheet Project (GISP) ice cores and the Byrd and Vostok cores from Antarctica. (The orignal dataset is located at ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/synchronization/) | [] | [] | false | false |
Siple Dome Methane Record
|
0512971 |
2003-08-18 | Brook, Edward J. |
High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change |
This data set is part of the WAISCORES project, an NSF-funded project to understand the influence of the West Antarctic ice sheet on climate and sea level change. WAISCORES researchers acquired and analyzed ice cores from the Siple Dome, in the Siple Coast region, West Antarctica. Brooks measured methane in approximately 196 samples between 55.6 and 738.5 m (0-20 ka) in the Siple Dome ice core, and then extended the Siple Dome methane record at medium resolution down to about 860m, corresponding to an age of about 45 ka. The team compared the results with data from the Greenland Ice Sheet Project 2 (GISP2) and the Greenland Ice Core Project (GRIP). | ["POINT(-149 -81)"] | ["POINT(-149 -81)"] | false | false |
Three-Hourly Antarctic Automatic Weather Station Data, 1980-2000
|
9419128 9527603 |
2003-08-18 | Stearns, Charles R.; Keller, Linda M.; Weidner, George A.; Lazzara, Matthew |
Continuation for the Antarctic Automatic Weather Station Climate Program 1995-1998 |
The Automatic Weather Station (AWS) Project, funded by the NSF Office of Polar Programs, involves collecting meteorological data from an array of automatic weather stations in Antarctica, Greenland, and Peru. Data collection in Antarctica began in 1980. Data are available in tabular ASCII format via the University of Wisconsin's AWS Project Web site at http://uwamrc.ssec.wisc.edu/aws/. Both raw and 'corrected' versions of the data are available via ftp. Information about data processing and station characteristics is also provided. | [] | [] | false | false |
GISP2 (B and D Core) Methane Concentrations
|
0512971 |
2003-05-14 | Brook, Edward J. |
High Resolution Records of Atmospheric Methane in Ice Cores and Implications for Late Quaternary Climate Change |
The data include methane data from the Greenland Ice Sheet Project 2 (GISP2) B & D Cores. Gas ages were calculated according to the methods described in Brook et al. 1996, and are subject to change. Ice ages were calculated by by linear interpolation from the Meese et al. timescale. | ["POINT(-149 -81)"] | ["POINT(-149 -81)"] | false | false |